Gish is a ball of tar with eyes that you can make jump, stick, slide, and push. It looks like your average platform puzzle game, but Gish's abilities combined with a physics engine make for a unique game. A cute visual style and some funny characters to boot. That's right, I said cute. You want to make something of it?
It was a finalist at the 2004 Independent Games Festival (well, along with 110 other games, but I swear it's good). Check out the 8MB at the bottom of the linked page and try it for yourself.
Read - Gish [Chronic Logic]