Our TD game (focusing on the TD mechanics) is featured on Google Play. You can get the free game here: https://play.google.com/store/apps/details?id=com.mcpeppergames.ColorDefense&hl=de You also can get a premium version (which is cheaper if you don't want ads and also the themes and some more Nanites in the game): https://play.google.com/store/apps/details?id=com.mcpeppergames.ColorDefensePremium2&hl=de - Chris www.ColorDefense.de
This game remembers me Geo Defense, too much. I really didn't like the premium app style mixed with paid app. I would prefer much more to pay just one time for it. Besides that it seems a great TD defense game, one of the few goods we have today.