This is quite probably the best 3D platformer out there; certainly the best I've played. It pre-empts Super Mario Galaxy (often held up as an example of a particularly good 3d playformer) multiple times, try "The Milkman Conspiracy" and you'll see what I mean. The style and story are fantastic, as well as being genuinely funny. The only problems I found was that the cutscenes are pre-rendered at a quality below what you run the game at, and that the keyboard controls aren't ever adequately explained, or indeed visible, and so the more hidden controls can only be learnt via trial and error, late in the game where you are required to use them, but could have benefitted from them earlier. Otherwise a stellar title.

Its pretty, its Legend of Zelda Phantom Hourglass combat, and if you play your cards right, its free!