Hey! I just jumped on and played again, because the art is so good, and one more thing jumped out at me, if you are going to work on it more: the notes making different sounds during the same level, made it much less of a music game and much more of a looking and following game. I never got to know which note made which sound, so I couldn't listen and feel my way through levels, I had to watch and count the flashing lights.
Great design though. I hope you keep working on it. I love these kinda games.