Spam, Spam, Spam
Bit too easy imho , just keep looking for weapons , get the sawed off shotgun and you've basically won. Just stand in the middle of your base , and shoot the middle of the map , over and over again . You can't lose . Once you get this weapon , keep looking till you get the Barrett , the final weapon , and switch that to your life support.
Overall , its good , but a bit too easy .