GoatUp is a surreal game made by Jeff Minter, the game developer behind Xbox Live's Space Giraffe and a number of other colorful (and often abstract) retro games over the years. GoatUp has you, as a goat, jumping up a series of platforms while eating grass and collecting various items. The gameplay is often wild, as the series of worlds you go through features homages to the various ages of platforming games. It's always crisp and interesting, with excellent retro graphics, finely tuned controls, and a fun set of mechanics. Everything is backed up by a plethora of gaming references, from the silly to the extremely subtle.
GoatUp is a simple title, but it's a lot of fun, and it shows just how much joy the iOS platform seems to inspire in a very experienced developer like Minter. The game features both OpenFeint and Game Center integration, and it's available from the App Store as a universal app right now for US$1.99.