Wimp: Who stole my pants? Dumb name for a really, really fun platformer. Great game mechanics with reasonably (but not maddeningly so) challenging levels. One of the few platformers that I feel compelled to finish.
Some of these probably stretch the definition of 'plantform' a bit, but they're all excellent: Wimp: Who Stole my Pants Bobbing Rayman: Jungle Run Mirror's Edge Robot Wants Kitty Jazz: Trump's Journey Another World