Anomaly Warzone Earth HD. Right now. Go on.
Hmm, you're still here. We honestly hoped that would work, but we suppose we can deign to sell you on the idea a little bit. So, for starters, Anomaly Warzone Earth is an excellent blend of futuristic tower defense and real-time strategy, but that's old news. The big story is that the formerly iPad-only game is now a Universal app. Better yet, it's on sale for $2! So, what are you waiting for?
... Oh, the name? Yeah, we're sorry about that. We've begged them to change it. But c'mon, you're gonna have to meet us halfway here.