That's awesome! This is actually a Godot learning project. Part of the idea was to see if its possible to make nice looking 3D in Godot (coming from a bunch of Unity developers). I think the results came pretty nice!
It's not open source, but it's possible I can share with you some details about the project set up. I'm Whisker on the cozy jam discord if you want to dm me.
Thanks so much for playing and the kind comments <3