The story: Somewhere in a distant galaxy an evil emperor leads his green hordes, attacking all planets he can reach. There is only one planet left free and you are going to help it. Gameplay: You need to defend your base in order to survive. Fight (click) green invaders descending from the top of the screen, kill bosses, collect rubbies and use multiple power-ups that enemies drop when destroyed.
aliens, box2d, click, defense, en, green men, physics, shooter, ufo, upgrades, Click defense: green danger