I think maybe you could make the player a little slower since dodging is very hard and more often then not you just runaway instead. I think the idea of shooting on beat is really cool though. The graphics are really creative I love the art style you went for its very unique and different. Although I think you could make the bosses for each level a bit more different .
The audio Very good! I'm not sure if the glitching was on purpose but again the music is very on sync with the bullets and that was nice but I'm not sure if the bosses were all synced with the music I couldn't really tell. This is also just a really creative game! The idea has been done before but I liked what you did with it, with this being a bullet hell where you also are firing. Not exactly sure how the concept of scaling was used here but yeah in general really good game!