Code - Effect
iamgod! - Lots of ammo, and lots of points!
ammogod - Lots of ammo
hilevel - Go to last level
points - Lots of points
slowman - Alien moves really slowly
fastman - Alien moves so quickly, you hit him every time!
yougirl - Alien turns into a girl alien
bigboss - Alien grows really big
minime - If alien big, it gets to normal size again