This is a fun time-killer coming out of the swarm mode from Outpost: Haven. This time, with ten maps, there is a lot more variety in setting than just five maps. Plus there are maps with hazards such as water or laser beams. The China Lake is still powerful even though it is not the monster it used to be in the original. Above else, the same weapons, perks, and ranking system from Outpost: Haven apply to this game. Since you did not include new weapons or perks, this is nothing more than a game that is a mode from another game with more maps (at least some have hazards!).
It is good that you included a partner, but one thing that could be changed is that the player should be able to change the weapon of their partner, as well as the perks. That way he will not be stuck with the same assault rifle all the time.
By the way, what happened to the high scores? It was a way to encourage people to try harder to compete with the rest of the world in terms of scoring. It was in the original, why not this?
I have a problem: the kills without a laser sight does not seem to count toward the challenge "Kills without laser sight." Even though I killed something with a China Lake without laser sight, the challenge progress for "Where Are You?" was still 0% at Level 0! I fear that this might be a bug -- kills with no laser sight should count!
Whatever, this game is nothing more than an expansion of a particular mode featured in another game. I still enjoyed it; that is what counts.