The game is alright. No bugs that I noticed outside of the High Score tracker not resetting when you die (not sure if that was intentional or not). No music played when I played the game which was a little odd for a rhythm game. I also noticed that the game always spawned 5 blue circles and then 5 red circles. It would add some challenge if that got mixed up a bit more.
It's a interesting idea that needs to be expanded a bit more.