Thumbstar Games, whose previous work appears to be an Android version of that game they played in Hackers, has launched its new shooter/tower defense game for Android, Meltdown on Mars. The game is reminiscent of Gun Bros., with some tower defense elements adding an extra layer of strategy to the game.
The game utilizes a dual-virtual-joystick system to move and shoot. You can also create and upgrade towers to help you defeat the incoming invasion. The game is a nice blend of action and strategy. Straight tower defense games are fun, but can get a little tedious once you've settled into a strategy and wait for the automated enemies to come flooding in.