Experimental Shooter

Experimental Shooter is a nice little puzzle shooter cross-over where the rules of the game change each level. You control a little "cannon" in the middle of the screen and you have a number of "enemies" (white balls) either moving around or lined up in some way on the level. Your goal is to clear the level according to the rules of that particular level. In one level you might have to shoot all your targets within a certain time, in another you need to bounce your shots at least once before hitting the enemies, in yet another you get to play pool and try to pocket the enemies.

http://armorgames.com/play/12154/experimental-shooter