Halfbrick Studios is one of my favorite developers on iOS. While they've released games on other platforms before (including the PS3 and the Nintendo DS), here at GDC 2011, they told me that "iOS development is always our focus." They've found a huge hit with Fruit Ninja, but they're not resting on their laurels. Fresh off Monster Dash (my favorite Canabalt-alike on the App Store) Halfbrick is going to return to the running genre with a new game called Machine Gun Jetpack.
If you've played Monster Dash, you'll know that's one of the special weapons from the game -- a machine gun pointed down that allows you to hover in the air. And the Machine Gun Jetpack game lets you do just that. As hero Barry Steakfries runs along, he has to jump up and hover past obstacles and enemies, adding a vertical component to the Canabalt setup. Just like Monster Dash, things get fast and furious, though unlike Monster Dash, you haven't got much room for error -- one hit and it's game over (unless you're lucky -- read on).