Plasq.com has released their first iPhone game to the App Store. Pharos IV: Assault [App Store] is available for an introductory price of only $0.99. The game is a space shooter in which you must defend your starbase:
Your mission: defend the starbase at all costs against all comers. Enemy fighters and destroyers relentlessly attempt to eliminate you and your starbase - but your superior technology and skill might be able to prevail. Refuel in the treacherous neighboring nebula - but watch out for wandering asteroids! Good Luck!
The game uses the iPhone's accelerometer to control the ship's movement. In the end, this works reasonably well once you get used to it. A Lite version is also available [App Store] so you can try out the first three levels.