Not sure if gravity, asteroids and space birds are your thing? Well...
The App Store now has a FREE version of Angry Birds Space for iOS devices, like the iPad and iPhone! You'll have access to the first 10 levels, which should give you a pretty good idea of what to expect.
Download on iPhone: http://rov.io/M69lkO
Download on iPad: http://rov.io/LeNMz8
Free versions of Angry Birds Space contain third party advertisements, upgrade Angry Birds Space for an ad-free universe.