We weren't overwhelmed by it, but maybe you want to give Castlevania: Harmony of Despair a shot. The newest Castlevania title is being released today via XBL as part of the Summer of Arcade, so check out Harmony of Despair in all of its very difficult 2D glory if it sounds like something that you'd like to play. It, like the rest of the games in the Summer of Arcade series will cost 1200 MSP.
[Castlevania: Harmony of Despair]-1200MSP