Pacman: The Platformer

[FlyingMonkey]

I have used the free version of Acorn for about a year now. Being a Mac user, I was never comfortable with Pixen or paint. But I wanted something simple that allowed me to effectively work at the pixel level. Acorn has done a fantastic job at aiding me in pixeling! The controls are simple like Paint, but can be customized to be much more like a Photoshop. Why not give it a try?

http://flyingmeat.com/acorn/

Also, Acorn just recently got an update, so there may no longer be a free version available. Now there may only be a trial version. Either way, I'd recommend you play with it for a while.