The year is 2015 in the Astrobot tower defense game.  The alien invaders are storming your lunar base and you must defend it at all costs.  You need to use your best defense strategy to stop the aliens from destroying the gates that are keeping them out.  Once they get in they will attack your base.  Use your gatling gun and turret to blast the creeps that are attacking.  There is survival mode and campaign mode for you to try and beat in the Astrobot tower defense game.  You can access your base menu when there are too many monsters attacking so that you can build new guns and tower defenses.

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