Really fun game, I was a bit worried that I wouldn't be able to tell when the music would shift and would run into an enemy right as I became vulnerable, but you did a very good job of building up to both the aggressive and passive phases of the music. Some issues I did have were the controls felt a little slippery, though that could arguably just be part of the challenge and as intended, and there was a lack of feedback when I took damage so it could be easy to miss if I wasn't paying enough attention.
Overall I still had a good amount of fun and really enjoyed this, also congratulations on your submission! I hope you finish many more fun games :)