Well, the concept is not very original.
But the fact that the heads have to stay around the targets make it a little more challenging.
Graphics are good, the music is kinda repetitive.
A weird thing is that i'm sure i've already hear this music. Can u tell where did you found it ?
The game need a little more polish, the stars particles sometimes are stuck on the floor, when the screen shake, we see white lines instead of scenery, the level isnt shown near the "Level" text...
But globally the game is well made, continue like that :)