Ambia

I haven't really decided if I like this game yet, but it does have some novel features. Ambia is a platformer where you control a little red guy with a gun and your goals is to kill all enemies on the level before you move on to the next one. For each killed enemy you gain some experience that you use to power-up your current weapon. The rather odd thing is that the experience is bound to the weapon and not to your character. This means that if you pick up a new weapon your experience is reset.

http://www.kongregate.com/games/captain_404/ambia