diff --git a/.github/workflows/build-samples.yml b/.github/workflows/build-samples.yml
new file mode 100644
index 00000000..0153a921
--- /dev/null
+++ b/.github/workflows/build-samples.yml
@@ -0,0 +1,89 @@
+# Builds the sample projects on multiple targets to check for compiler errors.
+
+name: Build Samples
+
+on:
+  #push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [windows-latest, ubuntu-latest, macos-latest]
+        target: [cpp, html5, hl]
+      fail-fast: false
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v6.0.2
+
+      - name: Setup Haxe
+        uses: FunkinCrew/ci-haxe@v3
+        with:
+          haxe-version: 4.3.7
+
+      - name: Setup HMM
+        # Workaround for an error on the Windows target
+        #env:
+        #  HAXEPATH: ${{ env.HAXE_STD_PATH }}/..
+        run: |
+          haxelib --global --quiet install hmm
+          haxelib --global run hmm setup
+
+      - name: Install sample dependencies
+        shell: bash
+        run: |
+          for sample in samples/*; do
+            if [ -d "$sample" ] && [ -f "$sample/hmm.json" ]; then
+              echo "Installing dependencies for $sample"
+              (cd "$sample" && haxelib run hmm install --quiet)
+            fi
+          done
+
+      - name: Build Flixel Sample
+        working-directory: ./samples/flixel
+        run: |
+          haxelib run lime build ${{ matrix.target }} --no-output
+
+      - name: Build ZIP Flixel Sample
+        working-directory: ./samples/flixel_zip
+        run: |
+          haxelib run lime build ${{ matrix.target }} --no-output
+
+      - name: Build Heaps Sample
+        if: matrix.target == 'hl'
+        working-directory: ./samples/heaps
+        run: |
+          haxe hl.hxml
+
+      - name: Build NME Sample
+        if: matrix.target != 'hl'
+        working-directory: ./samples/nme
+        run: |
+          haxelib update --always --quiet
+          echo y | haxelib run nme build ${{ matrix.target }}
+
+      - name: Build OpenFL Sample
+        working-directory: ./samples/openfl
+        run: |
+          haxelib run openfl build ${{ matrix.target }} --no-output
+
+      - name: Build OpenFL (Firetongue) Sample
+        working-directory: ./samples/openfl_firetongue
+        run: |
+          haxelib run lime build ${{ matrix.target }} --no-output
+
+      - name: Build OpenFL (HScript) Sample
+        working-directory: ./samples/openfl_hscript
+        run: |
+          haxelib run openfl build ${{ matrix.target }} --no-output
+
+      - name: Build OpenFL (HScript with Classes) Sample
+        working-directory: ./samples/openfl_hscript_class
+        run: |
+          haxelib run openfl build ${{ matrix.target }} --no-output
+
+
diff --git a/include.xml b/include.xml
index e28dae2b..9e3d2b98 100644
--- a/include.xml
+++ b/include.xml
@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <project>
   <!-- These values are added to the project XML when you include this library. -->
+  <haxelib name="jsonpath" />
+  <haxelib name="jsonpatch" />
+  <haxelib name="thx.core" />
   <haxelib name="thx.semver" />
   <!-- <haxelib name="hscript" /> This library is now OPTIONAL. -->
   <!--
diff --git a/polymod/Polymod.hx b/polymod/Polymod.hx
index a7891a3d..fd79b238 100644
--- a/polymod/Polymod.hx
+++ b/polymod/Polymod.hx
@@ -851,6 +851,7 @@ class Polymod
     }
   }
 
+  #if lime
   /**
    * Get a list of all the available scripted classes (`.hxc` files), interpret them asynchronously, and register any classes.
    * Called on platforms that don't support synchronous file access.
@@ -889,6 +890,12 @@ class Polymod
 
     return futures;
   }
+  #else
+  public static function registerAllScriptClassesAsync()
+  {
+    throw 'Function not supported on current target';
+  }
+  #end
 
   /**
    * Dispatch an error message with the severity `PolymodErrorType.ERROR`.
diff --git a/polymod/backends/HEAPSBackend.hx b/polymod/backends/HEAPSBackend.hx
index 8094207b..413aa127 100644
--- a/polymod/backends/HEAPSBackend.hx
+++ b/polymod/backends/HEAPSBackend.hx
@@ -102,6 +102,11 @@ class HEAPSBackend implements IBackend
     throw 'Function not implemented';
   }
 
+  public function listLibraries():Array<String>
+  {
+    throw 'Function not implemented';
+  }
+
   public function getPath(id:String):String
   {
     throw 'Function not implemented';
@@ -293,16 +298,16 @@ class ModFileEntry extends BytesFileEntry
     return super.getBytes();
   }
 
-  override function readByte():Int
+  override function readBytes(out:Bytes, outPos:Int, pos:Int, len:Int):Int
   {
     initBytes();
-    return super.readByte();
+    return super.readBytes(out, outPos, pos, len);
   }
 
-  override function read(out:Bytes, pos:Int, size:Int)
+  override function readFull(bytes:Bytes, pos:Int, len:Int)
   {
     initBytes();
-    return super.read(out, pos, size);
+    return super.readFull(bytes, pos, len);
   }
 
   override function loadBitmap(onLoaded:LoadedBitmap->Void):Void
diff --git a/polymod/backends/LimeBackend.hx b/polymod/backends/LimeBackend.hx
index 748d8f2c..e0b9624d 100644
--- a/polymod/backends/LimeBackend.hx
+++ b/polymod/backends/LimeBackend.hx
@@ -1,6 +1,5 @@
 package polymod.backends;
 
-import lime.system.ThreadPool;
 import polymod.backends.PolymodAssetLibrary;
 import polymod.backends.PolymodAssets.PolymodAssetType;
 import polymod.fs.PolymodFileSystem;
@@ -18,6 +17,7 @@ import unifill.Unifill;
 import lime.app.Future;
 import lime.graphics.Image;
 import lime.net.HTTPRequest;
+import lime.system.ThreadPool;
 import lime.text.Font;
 import lime.utils.Assets;
 import lime.utils.Bytes;
diff --git a/polymod/backends/NMEBackend.hx b/polymod/backends/NMEBackend.hx
index bc6e8202..0006d292 100644
--- a/polymod/backends/NMEBackend.hx
+++ b/polymod/backends/NMEBackend.hx
@@ -165,6 +165,11 @@ class NMEBackend implements IBackend
     throw 'Function not implemented';
   }
 
+  public function listLibraries():Array<String>
+  {
+    throw 'Function not implemented';
+  }
+
   public function getPath(id:String):String
   {
     throw 'Function not implemented';
diff --git a/polymod/backends/PolymodAssetLibrary.hx b/polymod/backends/PolymodAssetLibrary.hx
index 2b198e9e..fecd1ec9 100644
--- a/polymod/backends/PolymodAssetLibrary.hx
+++ b/polymod/backends/PolymodAssetLibrary.hx
@@ -652,7 +652,7 @@ class PolymodAssetLibrary
         typeLibraries.get('default').push(f);
       }
 
-      #if openfl
+      #if (openfl && !nme)
       if (assetType == FONT)
       {
         var fontBytes = fileSystem.getFileBytes(file(f, d));
@@ -713,7 +713,7 @@ class PolymodAssetLibrary
       type.set(f, assetType);
       if (!typeLibraries.exists(libraryId)) typeLibraries.set(libraryId, []);
       typeLibraries.get(libraryId).push(f);
-      #if openfl
+      #if (openfl && !nme)
       if (assetType == FONT)
       {
         var fontBytes = fileSystem.getFileBytes(file(f, redirectPath));
diff --git a/polymod/fs/MemoryZipFileSystem.hx b/polymod/fs/MemoryZipFileSystem.hx
index 6ea0cde2..92bd51e0 100644
--- a/polymod/fs/MemoryZipFileSystem.hx
+++ b/polymod/fs/MemoryZipFileSystem.hx
@@ -16,12 +16,12 @@ class MemoryZipFileSystem extends StubFileSystem
   public function new(params:ZipFileSystemParams)
   {
     super(params);
-    Polymod.error(FUNCTIONALITY_NOT_IMPLEMENTED, "This file system not supported for this platform, and is only intended for use in html5");
+    Polymod.error(POLYMOD_FUNCTIONALITY_NOT_IMPLEMENTED, "This file system not supported for this platform, and is only intended for use in html5");
   }
 
   public function addZipFile(zipName:String, zipBytes:Bytes)
   {
-    Polymod.error(FUNCTIONALITY_NOT_IMPLEMENTED, "This file system not supported for this platform, and is only intended for use in html5");
+    Polymod.error(POLYMOD_FUNCTIONALITY_NOT_IMPLEMENTED, "This file system not supported for this platform, and is only intended for use in html5");
   }
 }
 #else
diff --git a/polymod/hscript/_internal/PolymodScriptClass.hx b/polymod/hscript/_internal/PolymodScriptClass.hx
index 53e9dc5a..ef11bc13 100644
--- a/polymod/hscript/_internal/PolymodScriptClass.hx
+++ b/polymod/hscript/_internal/PolymodScriptClass.hx
@@ -183,6 +183,7 @@ class PolymodScriptClass
     }
   }
 
+  #if lime
   static function registerScriptClassByPathAsync(path:String):lime.app.Future<Bool>
   {
     var promise = new lime.app.Promise<Bool>();
@@ -231,6 +232,7 @@ class PolymodScriptClass
     // Await the promise
     return promise.future;
   }
+  #end
 
   /**
    * Returns a list of all registered classes.
diff --git a/samples/flixel/hmm.json b/samples/flixel/hmm.json
index f7fdfc87..3bbc308f 100644
--- a/samples/flixel/hmm.json
+++ b/samples/flixel/hmm.json
@@ -45,7 +45,9 @@
     },
     {
       "name": "thx.semver",
-      "type": "haxelib"
+      "type": "git",
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.semver"
     }
   ]
 }
diff --git a/samples/flixel_zip/hmm.json b/samples/flixel_zip/hmm.json
index 3cff2bd9..0a7cfb9d 100644
--- a/samples/flixel_zip/hmm.json
+++ b/samples/flixel_zip/hmm.json
@@ -25,6 +25,16 @@
       "type": "haxelib",
       "version": null
     },
+    {
+      "name": "jsonpatch",
+      "type": "haxelib",
+      "version": null
+    },
+    {
+      "name": "jsonpath",
+      "type": "haxelib",
+      "version": null
+    },
     {
       "name": "lime",
       "type": "haxelib",
@@ -40,10 +50,17 @@
       "path": "../..",
       "type": "dev"
     },
+    {
+      "name": "thx.core",
+      "type": "git",
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.core"
+    },
     {
       "name": "thx.semver",
-      "type": "haxelib",
-      "version": null
+      "type": "git",
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.semver"
     }
   ]
 }
diff --git a/samples/heaps/hmm.json b/samples/heaps/hmm.json
index 6d360aaa..ffab65d5 100644
--- a/samples/heaps/hmm.json
+++ b/samples/heaps/hmm.json
@@ -1,5 +1,10 @@
 {
   "dependencies": [
+    {
+      "name": "format",
+      "type": "haxelib",
+      "version": null
+    },
     {
       "name": "heaps",
       "type": "haxelib",
@@ -15,15 +20,32 @@
       "type": "haxelib",
       "version": null
     },
+    {
+      "name": "jsonpatch",
+      "type": "haxelib",
+      "version": null
+    },
+    {
+      "name": "jsonpath",
+      "type": "haxelib",
+      "version": null
+    },
     {
       "name": "polymod",
       "path": "../..",
       "type": "dev"
     },
+    {
+      "name": "thx.core",
+      "type": "git",
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.core"
+    },
     {
       "name": "thx.semver",
-      "type": "haxelib",
-      "version": null
+      "type": "git",
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.semver"
     }
   ]
 }
diff --git a/samples/heaps/res/data/greeting.txt b/samples/heaps/res/data/greeting.txt
new file mode 100644
index 00000000..af5626b4
--- /dev/null
+++ b/samples/heaps/res/data/greeting.txt
@@ -0,0 +1 @@
+Hello, world!
diff --git a/samples/heaps/res/data/objects.json b/samples/heaps/res/data/objects.json
new file mode 100644
index 00000000..c20b7397
--- /dev/null
+++ b/samples/heaps/res/data/objects.json
@@ -0,0 +1,6 @@
+{
+  "object_0": { "value": "moon" },
+  "object_1": { "value": "star" },
+  "object_2": { "value": "sun" },
+  "nested": { "object": { "array": ["a", "b", "c"] } }
+}
diff --git a/samples/heaps/res/data/objects.xml b/samples/heaps/res/data/objects.xml
new file mode 100644
index 00000000..280a9584
--- /dev/null
+++ b/samples/heaps/res/data/objects.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<data>
+	<object id="0" value="moon" />
+	<object id="1" value="star" />
+	<object id="2" value="sun" />
+</data>
diff --git a/samples/heaps/res/img/a.png b/samples/heaps/res/img/a.png
new file mode 100644
index 00000000..97284217
Binary files /dev/null and b/samples/heaps/res/img/a.png differ
diff --git a/samples/heaps/res/img/b.png b/samples/heaps/res/img/b.png
new file mode 100644
index 00000000..d00c34d2
Binary files /dev/null and b/samples/heaps/res/img/b.png differ
diff --git a/samples/heaps/res/img/c.png b/samples/heaps/res/img/c.png
new file mode 100644
index 00000000..38400d98
Binary files /dev/null and b/samples/heaps/res/img/c.png differ
diff --git a/samples/nme/hmm.json b/samples/nme/hmm.json
index e9dc5449..eda95e7c 100644
--- a/samples/nme/hmm.json
+++ b/samples/nme/hmm.json
@@ -10,15 +10,29 @@
       "type": "haxelib",
       "version": null
     },
+    {
+      "name": "nme-toolkit",
+      "type": "haxelib",
+      "version": null
+    },
     {
       "name": "polymod",
       "path": "../..",
       "type": "dev"
     },
+    {
+      "name": "thx.core",
+      "type": "git",
+      "dir": null,
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.core"
+    },
     {
       "name": "thx.semver",
-      "type": "haxelib",
-      "version": null
+      "type": "git",
+      "dir": null,
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.semver"
     }
   ]
 }
diff --git a/samples/openfl/hmm.json b/samples/openfl/hmm.json
index c8efc8b4..cdc316e6 100644
--- a/samples/openfl/hmm.json
+++ b/samples/openfl/hmm.json
@@ -10,6 +10,16 @@
       "type": "haxelib",
       "version": null
     },
+    {
+      "name": "jsonpatch",
+      "type": "haxelib",
+      "version": null
+    },
+    {
+      "name": "jsonpath",
+      "type": "haxelib",
+      "version": null
+    },
     {
       "name": "lime",
       "type": "haxelib",
@@ -25,10 +35,19 @@
       "path": "../..",
       "type": "dev"
     },
+    {
+      "name": "thx.core",
+      "type": "git",
+      "dir": null,
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.core"
+    },
     {
       "name": "thx.semver",
-      "type": "haxelib",
-      "version": null
+      "type": "git",
+      "dir": null,
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.semver"
     }
   ]
-}
+}
\ No newline at end of file
diff --git a/samples/openfl_firetongue/hmm.json b/samples/openfl_firetongue/hmm.json
index 2c9b37b9..ce7daf6c 100644
--- a/samples/openfl_firetongue/hmm.json
+++ b/samples/openfl_firetongue/hmm.json
@@ -15,6 +15,16 @@
       "type": "haxelib",
       "version": null
     },
+    {
+      "name": "jsonpatch",
+      "type": "haxelib",
+      "version": null
+    },
+    {
+      "name": "jsonpath",
+      "type": "haxelib",
+      "version": null
+    },
     {
       "name": "lime",
       "type": "haxelib",
@@ -30,10 +40,19 @@
       "path": "../..",
       "type": "dev"
     },
+    {
+      "name": "thx.core",
+      "type": "git",
+      "dir": null,
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.core"
+    },
     {
       "name": "thx.semver",
-      "type": "haxelib",
-      "version": null
+      "type": "git",
+      "dir": null,
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.semver"
     }
   ]
 }
diff --git a/samples/openfl_hscript/hmm.json b/samples/openfl_hscript/hmm.json
index 0bfaa61d..3a78979b 100644
--- a/samples/openfl_hscript/hmm.json
+++ b/samples/openfl_hscript/hmm.json
@@ -15,6 +15,16 @@
       "type": "haxelib",
       "version": null
     },
+    {
+      "name": "jsonpatch",
+      "type": "haxelib",
+      "version": null
+    },
+    {
+      "name": "jsonpath",
+      "type": "haxelib",
+      "version": null
+    },
     {
       "name": "lime",
       "type": "haxelib",
@@ -30,10 +40,19 @@
       "path": "../..",
       "type": "dev"
     },
+    {
+      "name": "thx.core",
+      "type": "git",
+      "dir": null,
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.core"
+    },
     {
       "name": "thx.semver",
-      "type": "haxelib",
-      "version": null
+      "type": "git",
+      "dir": null,
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.semver"
     }
   ]
 }
diff --git a/samples/openfl_hscript_class/hmm.json b/samples/openfl_hscript_class/hmm.json
index 0bfaa61d..3a78979b 100644
--- a/samples/openfl_hscript_class/hmm.json
+++ b/samples/openfl_hscript_class/hmm.json
@@ -15,6 +15,16 @@
       "type": "haxelib",
       "version": null
     },
+    {
+      "name": "jsonpatch",
+      "type": "haxelib",
+      "version": null
+    },
+    {
+      "name": "jsonpath",
+      "type": "haxelib",
+      "version": null
+    },
     {
       "name": "lime",
       "type": "haxelib",
@@ -30,10 +40,19 @@
       "path": "../..",
       "type": "dev"
     },
+    {
+      "name": "thx.core",
+      "type": "git",
+      "dir": null,
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.core"
+    },
     {
       "name": "thx.semver",
-      "type": "haxelib",
-      "version": null
+      "type": "git",
+      "dir": null,
+      "ref": "master",
+      "url": "https://github.com/fponticelli/thx.semver"
     }
   ]
 }