Very charming style!
Gameplay seems fine but I couldn't get very far, the game (v0163d) had a bunch of performance issues.
There's a ton of stuttering when models and effects load for the first time, this is expected for Godot you need to preload particles and models, for my game I'm loading an instance of them at startup and that mostly does the trick.
Other than that I had frequent crashes when entering mine floors, one time playing as the witch the level loaded but the loading screen didn't fade away and it stayed up even after going back to the menu and reloading the save, restarting fixed it.
I'll try this again next time hoping that it runs better, it looks like fun.