Wow..
You have a very, VERY interesting concept here! I love it! The space shooter/music based game is incredibly innovative but I see much room for improvement (not a bad thing, this could be a very good game with more work). To really give it the space shooter feel it needs powerups and weapons. Those make the game. Also the entire time i was playing i felt flooded by guys. Either give more space to move around or less guys. I think there should also be an element of music mixing involved here. If you make the shooter part less intense, you can make some sort of interaction with the music, like regulating a sound board or something to make it more interesting. I really hope to see another version of this in the future. Good luck on future flashes.