Looking at the screens the map lacks lighting color. Don't use white (or almost white) lights so often. Get in some yellows or blues.
I love most of the architecture. Very HL2-ish but if that is the goal (like here) I have no problem with it. I might take a closer look later.
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EDIT:
Alright I took a closer look at the map and it looks fantastic. I decided to make a slideshow/screenshot feedback parade Orpheus-style to show you some of the details that I think could need some attention. Sorry for the chinese-mobile-phone-manual grammar and the bad hosting.
http://mitglied.lycos.de/reaper47/7hour.html
Oh and yes, this soundscape it's ... well... it scared the s**t out of me. I can't listen to it for more than 5 minutes. It's making me totally crazy. In some way that's pretty cool but, lol, I had to put of my earphones off after a while because it really psyched me out. Maybe try more different ones or tune it down a bit?