Proof of concept.. but why not!
xcodebuild clean build CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO
# If the build fails on TouchLemmings/LemmingsScene.swift
# Update this file and change the minimal version of Mac OS X
open build/Release/TouchLemmings.app
Just hit the touch bar while the application is in the foreground. Tapping a walking lemming will transform it into a blocker. Tapping a floating lemming will cause it to land and start walking. Long press to clear the screen and start over.