This is the free single-life Survival version of ShootStorm, a fast-paced neo-retro 3D arcade shoot-em-up with touch and tilt control options.
Carve a circle as the enemies fly out at you, twisting and turning. Automatic shooting keeps the controls simple and the action fluid.
ShootStorm is a universal app compatible with everything that can run iOS games, and makes full use of retina displays.
Aim for the top of the Game Center high score table as you progress through the 40 achievements that reward your success.
Enjoy the screenshots, but they do not do ShootStorm Survival justice, movement brings the game to life.