That's such a good game :D
Art and sound is cool, and the gameplay is amazing.
The only small detail I found confusing is that I'm not sure when exactly the beat is, like I don't feel it's completely synced with the music and/or maybe there should be a better indicator eg. instead of the bottom of the screen, make a pulsating screen effect (eg. red vignette?).
But overall as I said, it's amazing :)