Headcase

You play as Norman Noggin, a comic obsessed kid who gets struck by some cosmic lightning. This of course transforms him into a superhero with an incredibly large head.

Norman now has the power to walk on walls and leap from the floor to the ceiling in a single bound. He has also gained access to a bizarre dream world, where you can use this skill to defeat your enemies and collect the green diamonds, which tend to be placed in between. It's a simple platformer with some crazy visuals but you would expect nothing less from a Nitrome game.