Handmark's just released a version of the game Platypus for the iPhone and iPod touch. You can download the side-scrolling shooter here at the iTunes App Store for $4.99. Based on the Mac and PC game from Idigicon and developed by Astraware, this arcade game is based off of characters and scenes made from modeling clay.

The original creator hand-built every ship, tree, and explosion using clay art, photographed them and created digital graphics for the game. Explosions within the game "splat" instead of "bang", for instance.

Here's a description of Platypus from Handmark:

Using a choice of control methods including the iPhone's built-in accelerometer, players pilot the venerable F-27 'Platypus' across squashy fields and trees, avoiding the snowy mountains to defend peaceful Mungola from invasion. Enemy ships disappear in a splat, and several different power-ups are available to assist with the 20-level mission across 4 huge clay scenarios.

See video below: