This is one of my favorite takes I've seen on the spin theme! The art style and music is really great!
I feel like one thing that would make this game better if you keep working on it would be hit effects when you or the boss gets hit. I think you have an opportunity to do something cool with it with the zoetrope effect. I'd suggest when the player or boss gets hit, the light flickers for a second or so and it plays a sound effect similar to when you die.
Amazing job, can't wait to see more!