a really nice to add feature would be to allow you to retry by clicking the space bar. A lot of times I am close to working out the angles of some shot and then have to move the mouse away to restart the level. If the spacebar could be used, then I could do a little better in that regard.
one of the problems I found in the game is that if it is too early to buy something, it will take my points and not let me buy anything else. This is frustrating as I would like to be able to upgrade other things. If you can't buy something to effect, please disable it as a buyable or fix the problem with my points disappearing.
not too bad! I didn't realize until later in the game that if you miss collecting a color that it will damage you as well. =\ Music is good for the game. Well done.