Star Sky, the atmospheric art-game by Mårten Jonsson released earlier this year to PC has been converted to the iPhone and iPad. Star Sky is a different kind of iOS game. It focuses on creating an atmosphere and being a relaxing, rather than being intense or having a 5-minute gameplay. It's an artful experience that is meant to be reflected upon, and replayed several times.
iTunes link - http://itunes.apple.com/app/star-sky/id485382329?mt=8
The games official site - http://www.jm-j.com/starsky