Portable Gamer - As dual stick shooters go, the App Store is beginning to become a bit crowded as of late. The problem is, with games of this variety, controls are a key aspect to success or failure. Though it has been lamented time and again, iOS devices tend to leave something to be desired in this department, given the lack of a tactile feedback controller of any sort. That said, when a developer nails the controls, it can be a big boost, even when the gameplay is somewhat derivative. So can newcomer Alien Space nail the navigation, or is it going to flame out in flight?