Run run run!
The guys behind Monday Night Combat have just put out a new iPhone and iPad game called Outland. I have yet to play it but based on the trailer it looks to echo games like Jetpack Joyride, Robot Unicorn Attack, and the like.
You can give it a shot right now for $0.99, and the game is compatible with iPhone 4 or higher, iPod Touch fourth generation or higher, and iPad 2 or higher. You'll also need to be on at least iOS 5 for Outland to work.