I really enjoyed this! The music / rhythm aspect kept me hooked. Original idea, nice execution. I kept coming back to it! In fact, I can't stop myself from hearing the music in my head!
A couple of minor feature requests: (1) the ability to pause, and (2) some kind of indicator that the player is at the edge of the room (I kept accidentally moving out of the room). Maybe the floor tiles at the edge could be a different color? Or maybe that's just on me to be more careful!
Overall - great job!