Android 4.2 and up is a pretty strict requirement. As
http://developer.android.com/about/dashboards/index.html says, Android 4.2 is only 1.2% of the market. My Verizon Samsung Galaxy Nexus that I got only 6 months ago still has Android 4.1; I can’t try your app out. Since you’re trying to sell your game, improving its compatibility should probably be a big priority.