Compatible enough for an HTC EVO 4G, but made for devices like the HTC EVO 3D, Balloon Gunner 3D brings balloon-based dogfighting slightly off the small screen. This is another game that utilizes stereoscopic 3D in an advantageous way.
The object is fairly simple: fly around, complete missions by shooting things, and don't get killed. I'd say on the 2D platform this is a meh game. It's fun, but tedious and feels kind of sparse.
Check out a 2D gameplay video if you're on the fence, which you shouldn't be since the game is free.
Links: Market (EVO) | Market (web)