XSp.

Developed by Twisted Pixel, Splosion Man is a platformer game where you can go around exploding yourself (and the enemies with you):

Love the idea! I remember there was this one Genesis game… I think it was called Ninja Warriors or something like this, where you could pick some sort of robot-ninja which the “special ability” was to explode himself killing all enemies on screen… ‘twas AWESOME! xD
Back to Splosion Man, it’s coming soon for the XBox Live Arcade!

Source: IndieGames