Monkeh II: A space adventure.

Immerse yourself in an intergalactic adventure across the stars as you fight monstrous xenomorphs and their scavenger minions. Blast them to pieces! Guts, sparks, and metal hurl themselves apart at your hand!

Fight your way through space against hordes of mutant 'Monkehs' with the crew of the UNS: Thunderchild. Battle your way through 6 action-packed levels with over 3 weapons! (That means four weapons).
It's a charming little fps game.

http://www.moddb.com/games/monkeh-ii-a-space-adventure