Aliens Must Die - Version 2.0 Aliens Must Die is a real runner. The simplest ever controls are giving this game that additional charm. It may not be the typical masculine shooting game. You are a small boy with a water gun, but that gun is the only way to eliminate octopus like aliens before they kill you. Free shooting games like this will not let you down once you start playing them. If not you, someone else will have hours of fun playing it.