That’s because Umoove Experience is a new iOS game that lets you control the 3-D game environments simply by moving your head:
The Umoove Experience is finally here! Control your iPhone/iPad using the gentle gestures of your head. Fly through a 3D village by just facing where you want to go. Get a first taste of the exciting Umoove powered games and apps.
Developed by Umoove, Umoove Experience is a flying game that’s aimed at demonstrating the basic capabilities of 3-D face-tracking as applied to gaming. The game has you moving in real life so that you can move in virtual space and be able to collect purple magic potions, which then enables you to continue with your explorations.
Umoove Experience is compatible with iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, fifth-generation iPod touch, iPad 2, third-generation iPad, fourth-generation iPad, iPad Air, iPad mini, and iPad mini with Retina display.