The waves moving to the beat on the main menu was wonderful. Like the top ones went with the drums, and the bottom ones strummed to the synth. I really liked that music, so I was a little sad it wasn't what played during the actual game.
The animations were really smooth too (especially the dying ones, which I saw an unfortunate amount of). I just thought most things moved a little too fast for me to react to.
I also appreciated that my high score was saved even after going back to the main menu before returning to play again.
Great work!