There are many aliens Appear on the screen, their common goal is to steal the pigs on earth to do some research, please help shooting aliens and protect pigs from being stolen!
You can click to select three weapons, such as: parabolic shooting / normal shooting / gravity control shooting (tilting the phone around to control the trajectory). Each weapon has a limit number of bullet. But do not worry, you can click on the icon suddenly appeared on the screen to add bullet number. Or you can also summon lightning to knock down all the aliens by clicking lightning icon!