the aliens from space fever are attacking earth, only this time new, giant alien species have arrived. shooting the aliens this time will either destroy them or split them into two smaller aliens.
the alien forces move back and forth across the screen, dropping closer to earth when they reach the edge. as you clear them, the remaining aliens will get faster and fire more shots. use the shields to protect yourself from enemy fire.
destroy all the aliens before they reach the bottom in order to move on to the next round.
the aliens all move in the same direction, and when they reach the edge of the screen they will either 