Oh crap, monstrous aliens have infiltrated your Moon Base...time for a shootout.
Top-down shooter against a plethora of colorful aliens with distinct abilities.
Navigate through multiple levels and rid this functioning, fortified factory of the invaders.
Exploit a tragic flaw in the moon facility to help kill aliens and pass levels (hint: break a window).
There's a big boss, though it's not particularly difficult.
Uncover a rather dark secret as you progress through the game...who is the real monster?