Space Invasion is a strategy defense game where you conquer new worlds with the ability to relocate your troops. At first you can use only infantry, but later you may add archers and different types of soldiers. Enemy is also either armed with knives and daggers, or they can carry some really heavy artillery as well. In that case your best bet is to relocate archers and place them in front of the enemy so they can throw arrows from the safe distance. The most interesting thing about this strategy is that you may freely relocate stickmen fighters across the map. Classic defense games usually do not have this feature, i.e. once you setup your turret, it becomes stationary object which shoots out in the same way from the same location until either it gets destroyed by the enemy or upgraded by you. As the game progress, you are about to experience more and more different enemies until you meet the big boss.