Since there has already been nice comments about it I'm going to point out a few negative sides. I don't think you utilized the theme enough. Blade Runner has an extremely rich theme and style. Some of the themes are paranoia, claustrophobia, retrofitting, corporatism, culture mash, desertion and globalization.
The areas are too open. The buildings should be looming over the player, blinding him with flashy advertisement and signs that scream for attention. The architecture should show signs of retrofitting (new applied to old) and overpopulation. Piping and ventilation should bleed out of the buildings.
While you have a nice atmosphere to it, it's not even close to what you can achieve if you apply these themes. Simply adding a few manholes with steam doesn't cut it. Not only is it not enough, but the contrast between not-steam and steam becomes too great. It needs to be omnipresent and not stick out like a sore thumb. Because of all the smoke in the movie, the film crew would constantly use gas masks during the outdoor filming. Blade Runner also uses light-blue color a lot, often with steam/smoke.
I can't find any good pictures of the movie, but I did find this picture from a competition at game-artist.net:
clickyNotice how it has used almost all of the characteristics and themes I've just described. Just applying a few of these to your current map will make a drastic improvement.