The alien ships have just left the warp gate and have entered the astroid field. Now is our only chance to stop them, deploy turrets to destroy their ships before they reenter the warp gate to get to Earth! With 15 levels of increasing difficulty and 5 sandbox levels to see how many waves you can destroy, this game will keep you busy for hours. To remove the ads, purchase Alien Assault TD from the iOS App Store for $2.99!