You have to shoot the aliens and stop them! Use the ARROW KEYS to move around and A and S to point your space ship in deferent directions. You must not let the aliens get past you, cause if they do... one innocent person dies and you lose a life, also every 20 aliens you kill, you get a better shield and earn one life. Get to 100 points for the final boss battle, don't die, save the word, oh and press SPACE to shoot. Good luck, commander!
I watched a video, don't know were it came from tho. I recommend staying at the bottom. Things may still be being added, so keep that in mind when you complain in the comments, just suggest something and I'll see what I can do.
