Not quite sure what is required of the player, since it is possible to just aim directly at the moon and fire in order to win (my projectile never collided with the obstacles flying around).
Just out of interest I attempted to bounce the projectile off of buildings, which worked nicely and surely would make a much more compelling game (if you had made a direct shot impossible). I like the fact that the camera tracks the projectile but it would be nice if the angle wasn't fixed (and therefore possible to use a boost in an arbitrary direction).