A really great map with some interesting design choices, although a few are somewhat questionable. The size and room variety is fantastic, on par with official maps.

In one room, I found a "path" that can only be taken by taking damage. Not an unsual thing, but usually this means dropping from a high ledge. In this case, it was actually a small hole in a wall where maintenance covers had been removed, and you could move through it by crouching. The damage comes from a broken piece of machinery venting flame into the hole. At first, I thought this was really original and interesting, but then I went through it with 100 health and armor. As a non-firebug, the combined total from crawling through the whole plus the after burn, I took 24 armor damage, and 5 health damage. That's ridiculous, considering these sorts of "trade-off shortcuts" bypass armor, and can easily be healed with your syringe if you're prepared. Personally I'd like to see this spot changed such that it bypasses armor, changing how it deals damage too, if necessary.

Nearly every area has 2-4 entrances/exits, but at one point I found myself cornered in a room with a closed door. Normally, doors start out open, or can't be opened, so I thought I was trapped. I interacted with the door anyway. A message appeared on my screen saying, "Emergency override accessed -- Door opening in 1 minute." By the time that minute expired, I had killed everything cornering me, and then the wave ended. The trader was on the otherside of this door. There were other ways into that room, yes, baut the map is complex enough that they were not easy to find on my first time playing, and the guide arrow insisted I go through the locked door. Had I not activated the door prior to the wave ending, I would have missed the trader. This timer definitely needs to be reduced, or the method of opening the door changed. I had the idea of several locks on one side of the door that you would have to shoot to disengage, after which the door would be unlocked, though the viability of that is questionable.

THere's also a blast door that works similarly, and my comments are just about the same. In the future, save slow opening doors and doors with timers for objective maps.

All in all, it's a very good map, but there are a few minor things I think need some work. Other comments point out some other issues I haven't discovered, as well.