I know what a Retina Display is even though it is a gimmick market term. I think rather than "Retina support" as a key feature, you should highlight it instead as "Optimized for the iPhone 4". Makes you look alot more inteligent; "Retina support" looks like you bought in to Apple's marketing terms.
@hondaa: Retina display is the name given to the screen of the iPhone 4 and iPod Touch 4G. These screens have a resolution of 960x480 with a pixel density 2x bigger than the screens of previous iPhones (326 ppi X 163 ppi). Retina support means that the game is optimized for this screen and will take full advantage of the Retina display when played on a device that supports it. The game will also run on older devices that doenot support Retina display . I don't have any plans for Android at the moment, but I think that it would be really nice to have an Android version. If the game sells well, it could happen. Thanks for your comment.
And I believe Android is a better market as of right now than iOS. On alot more devices than iOS is on.
Good look with your app