Nice game! The controls were smooth and responsive, and that's crucial for a rhythm game :)
I liked the idea of lighting the screen every time a note is executed correctly, it fits the theme. However, that's an evil decision for balancing: good players will see notes more clearly, having an easier game, while less-experienced players will have a harder and harder time. Was this "positive feedback" in mechanics intentional? I'm just asking for curiosity, there's not a wrong answer and no decision in inherently bad :)
Well... In my case I'm poor in rhythm games, so I enjoyed my little moment of despair :D
Lastly, I really liked the particle effects when the notes are pressed :)