I really liked the rhythm game idea, but I did have some issues with it:
1) It really could've used a tutorial, I was really lost for most of it.
2) The gameplay didn't feel very fluid. Like I get that the things were moving on the beat, but there was probably a better way to implement it, like for example have them speed up on the beat instead of being completely stopped. I'm not totally sure I just know it felt kinda weird.
Other than that, really cool concept, and I thought it was fun to play.