The map looks fantastic, very nice texturing style and as others have said, the coloured lighting is done very tastefully. Nice skybox too :) It was however way to dark, I could not see my attackers 50% of the time so that kind of ruined the gameplay for me unfortunately. I took some screenshots so you can see what its like on my pc...

http://daz.quaddicted.com/images/temp/slave1.jpg
http://daz.quaddicted.com/images/temp/slave2.jpg
http://daz.quaddicted.com/images/temp/slave3.jpg
http://daz.quaddicted.com/images/temp/slave4.jpg

A good tip (in case you didn't know) if you want to have a dark map but keep enemies illuminated is to light the floor a lot brighter than the walls / roof as the characters are lit based on the brightness of the floor below them.

The areas that were brighter were great fun to play though, monsters were well thought out and placed intelligently. I did get a bit annoyed at the constant spawning of enemies behind me (usually fiends) that then proceeded to snap my neck in two. I finally worked out that the warning message was to warn of enemies from behind... ;)

Overall.. Very nice map but the darkness kinda ruined it for me at least.