Ok, I had a fair bit of fun with this, here's my two cents:
Pros:
*Lighting was good, it really made the sewer feel atmospheric and all that,
*Cool custom character enemies!,
*Well picked weaponry,
*The paycore Weaponry place was well designed,
*Frame rate stayed constant. But then again I do have a good PC,
Cons:
*Enemies were a bit too easy to kill, 3 seconds of sustained fire of that SMG you start with, and they were toast,
*The hurtzone behind the car. That made me have to re-start the level, perhaps make the car a little more trashed, (fire?), to make it more obvious that going near it will kill you,
*The elevator on the left has no top to it's shaft, you can see the sky through it,
*A bit too dark at points in the sewer, I actuallly had to cheat and raise the ambience to get out of it,
*Menu was basic, but that's not really important,