Thank you for playing my game and for the feedback! I really appreciate it! :D
Yeah, I totally agree with you about the level design! I ended up spending the vast majority of my time programming the boss fight and doing the art for everything, and ended up not having that much time dedicated to building a fully built out level, so I ended up just making it a series of simple little encounters to make it feel a little fuller than /just/ a boss fight, but definitely the boss fight was the star of the show, haha!
I did set Godot's input mapping to support a gamepad - but I don't actually have on hooked up, so I didn't test the gamepad support! I'll definitely have to get one so I can check and see what's goin on with that setting, haha!