It's a skin for Aseprite to make it look like Godot To use, just...
- Download this repo as a zip
- Unzip it into a new folder (probably titled "Godot theme")
- Copy the folder into Aseprite's extention folder
- Open Aseprite and go to Edit>Prefrences>Theme
- Select the new theme
If you cant find the Aseprite's extention folder, open Aseprite and go to Edit>Prefrences>Theme, click default theme and press "Open Folder", finaly just go up one level.