Love this! Funny, fits the theme, follows the limitation, and the graphics are amazing. The environment design is great. How'd you like Godot for making a 3d game? I can't say I've tried it for that yet.
Godot is alright for 3D until you are not trying to make photorealistic graphics, but the quality is improving update after update. In 3.2 fbx and gltf 2.0 support was added, what makes it so much easier. Also it has some cool tools like 3d gridmaps and 3d navigation. You definitely should try it!