Walk around back and forth collecting as many cash bags as you can in addition to shooting all the angry little aliens. It is important to walk around because the cash bags will reappear after you collect them to give you a chance to score lots of points. When you are up high shoot down to make sure the little dudes don't blow you up from below. Shoot those huge rockets and UFO's to score big points. Submit your high score! Go.Go.Go.