Air Control meets tower defense game - that's the premise of a new game by Lemon Team, published by Amazon. This is the first game Amazon's published for Android (it's also on iOS), and it actually does look like a pretty interesting premise. You get a variety of planes which you route over a map, ala Air Control, and use those routes to destroy incoming enemies on the ground through various maps. It's a pretty cool mashup, if you ask me.
The game is free to play, and the only real push to purchase stuff comes in the form of maps, which you'll need to shell out $0.99 each for (or $2.99 for the pack) to get the entirety of the game.