-Press your left and right key to move your space ship. -Press the spacebar to shoot bullets at the moving aliens to get points. -Shoot mothership to earn bonus points. -You have only three lives and can not earn extra lives. -You can stay safe from the aliens bullets by hiding under the gray barriers. Also you cannot shoot through the barriers. -If you shoot barriers they will break and you can't have protection. -The farther the alien is from you the more points they are.
