Start shooting. You can control your hero by clicking the mouse and directing it. To turn around, just click the left button once. If aliens get close to you, the hero will automatically start shooting. Back off when you think you have too many enemies for you to do. If they can't see you, they can't kill you. As long as you kill aliens, you can make money. Use the money to change your character or buy new brands of more powerful weapons to increase your power.