you seem to have missed the point of these music-type games - it's the feeling that what you are doing playing the game is attached to what is going on in the music. after a bit, you can tell you're just playing a keyboard game while music plays in the background. which makes it instantly not fun. game looks neat and stuff, but the gameplay not great.
look for my flash game 'palin hero' if you want. it is certainly not great, but even though it looks way worse than your game, there is that attachment between the game play and the 'music'.
 "bang"){kind=icon}
 "The Cat that Got the Milk"){kind=icon}
 "Obsolescence"){kind=icon}
 "Framework"){kind=icon}
 "AWOL."){kind=icon}
 "Stratosfear"){kind=icon}
 "Drop."){kind=icon}
 "Test your reflexes"){kind=icon}
 "QBCube"){kind=icon}
 "Save Toshi"){kind=icon}
 "Spring Ball"){kind=icon}
 "Crazy Apartment"){kind=icon}
 "Unity3D PhysX Demolition"){kind=icon}
 "Exploration Around Us"){kind=icon}
 "Antimatiere"){kind=icon}
 "Second Person Shooter Zato"){kind=icon}
 "Creepy Creepers (Preview) (LOL'D)"){kind=icon}
 "FPS_Unity"){kind=icon}
 "Test2Game"){kind=icon}
 "Grammar Hero"){kind=icon}