Defensive Turret

A topic of strategies Tower Defense style is touched again. People try to defeat the aliens again. Turret is the main piece of ordnance here. Only when you destroy enemies you can get experience for ordnance upgrade.  

The main people colony went under ground and slowly restore their life. Your task is to stop waves of aliens so that they do not penetrate to the base exit. Long main campaign and battle for survival are waiting for you in this game.