Retro is an affordable, slickly produced cave-flyer game, similar to arcade classics such as Lunar Lander and Gravitar. You pilot a small ship that must navigate through increasingly tortuous caverns to rescue stranded scientists, tilting left and right while making judicious use of your main thruster to control your trajectory and overcome gravity's pull.
The interface makes smart use of your iPhone or iPod Touch's accelerometer for the game's core mechanic: you tilt the device to steer, and you tap the screen to thrust. You have to make a series of safe landings on each increasingly intricate level before you run out of shields and fuel, and you get a bonus for beating the level timer. Retro has three difficulty modes and exceptionally good graphics, sound effects, and in-game music. A must for fans of cave-flyer/little-dude-rescue games.