Hmmm.... I was looking for the guy who made this map. It appears I have found him:
First thing, I wanna go over a "sign" I saw in one of the later levels of your series... The playeres are in a sewer area, you climb up a ladder, and you see a sign that says:
WARNING:::: THIS FENCE WAS INSTALLED BY --->GONNAS<---
Coincidence? Or did Gonnas actually build that fence?
It was a good map, but I think you over did the black ops soldiers. You should have put in more vortigaunts and basic zombies. Black ops are the only monsters that (I) find a bit on the un reasonable side. If not, you should have put less in. Since just a few male black ops were able to run-havoc on my team and I.
I couldn't really figure out where it all "ended". Since you ended each map with "Made by Dan2020" (THats not your name!!!

Or is it? I didn't pay to much attention to your name. :\)
Over all, I thought it was good, but way to hard sometimes. Focus more on body count rather than challenge --- Sven players aren't that into challenges