I'm not in your target market (I don't own an iOS device) but have you thought about switching the order of the screenshots in the App store / iTunes preview?
On my display, the two screenshots that are visible by default don't communicate much information about what the game is like to play.
The last two screenshots that are visible by scrolling or swiping right convey much more information.
On my display, the two screenshots that are visible by default don't communicate much information about what the game is like to play.
The last two screenshots that are visible by scrolling or swiping right convey much more information.