THOUSANDS OF EVIL ALIEN MONSTERS ATTACK CONSTANTLY! BE ON YOUR TOES, STEER THE MASSES AND REACT FAST TO ENEMY AMBUSHES!

AUTOMATIC CHAINGUN TOWERS, HEAVY ARMED TRUCKS, HUGE DEFENSE TURRETS.

BLOOD, BODIES, BULLET CASINGS... ALL DESTRUCTION STAYS FOREVER

(Ohh and there's also a story):

The company has assigned you to investigate the sudden halt in communication from one of their high-tech research facilities.

They've picked up some strange bio-signals down there...

Palpus X Annihilation (2968860)