I hate to give an app just one star, but having actually paid for this game, it is severely lacking compared to even only the free games I've tried out for the iPhone. This is a space invaders-esque clone, so there are no new ideas here, but the performance of this app is badly lagging. I believe that adding the ability to control the ship's movement based on sliding your finger back & forth along the bottom of the display would improve things. If not that, then the tilt-sensitivity probably needs to be cranked up quite a bit for adequate control. I'm also not a fan of 'auto-fire'... I would prefer a button, or some such thing that could be pressed to fire instead. The ships movement is not at all smooth, and badly hinders any sort of enjoyable game play. If these issues get worked out, it could be a fun space-invaders clone.