Pixelartist Caleb Hystad, the animation director that turned Doom monsters into those tiny any cute sprites, has released a fun looking "iPhone story game" called Herbert's Day Out.

The interactive short story follows Herbert the pig as he "escapes his farm to quest for delicious tuffles, all the while keeping one step ahead of the farmer's dog".

Players hold their iPhones or iPod Touches horizontally and tilt the device to whichever direction they want to send Herbert, then tap the sceen whenever prompted with menus or options.

So, to sum it up: simple controls, charming art, a short and light story, and music from a singing cowboy, all for free. Why haven't you downloaded it yet?