Hey, this is awesome for me! I've been getting into sokoban, but have chronic hand pain (ulnar tunnel syndrome). It's way more comfortable to play classics like microban like this than it is to play conventionally!
The included level sets ought to last me a while, but is there a way to play other level sets? If not, would you ever consider publishing the source code? I'd be happy to contribute to this ^^
FYI, I just uploaded the Godot 3.5 project. Incorporating some other level sets should be relatively straightforward! Look at "parseLevels()" in "WorldState.gd"