Kick-Ass
This rocked, although it's kinda short. You need to make a few levels in between the first of it and the boss, like starting from the gate, you gotta go to Death, steal a key or something, then fight your way back to the gate? It could easily be extended into 3-5 stages (yeah, I know... it takes forever to do em up, but you could just re-use backgrounds and stuff) Anyways, nice work.