[SP] Psychosomnium
Potential cult map, oneiric and psychedelic. But not yet: at best, it's still an infant WIP which can't yet balance its shortcomings.
Let's drop the preliminaries: I'm into this kind of indie, artsy stuff like Hazard: The Journey of Life* or Sutef** (wtf is "Cactus and whatever"?). They succeed because they are not only mind provoking, but also beautiful if minimalist. Complainers who don't "get it" are bound to come, inevitably, and you need something sexy to back your position: it can't both play AND look like crap. You need to strenghten the map.
Because honestly, we're doing this for the weird surprise effect: anybody would drop a "normal" map, featuring that pitch black corridor 10 times. Make this fun and pleasant, in your map's best interest without entering the "me against the brutes" frame of mind when they ask for better quality.
There's your lightning. 
Take a look at someone else working on your same premises:
Unique Styled Map
It takes mad skills to make something stylized and looking good. If I may suggest, you might be better off working on a more surreal version of the current "secret rooms": think Silent Hill. Small note: the azure pit can be walked over with ease, should be wider.
*Sutef: http://rottentater.com/sutef/
**Hazard: The Journey of Life http://www.udk.com/showcase-hazard
Dammit, those aren't supposed to be pitch black!
If you type "buildcubemaps" into the console and then "mat_reloadtextures" and "mat_reloadmaterials", those pillars should look much better. I don't know how to get it to do that by default, however.
Thank you so much for your critique, though. I'll see what I can do to make this better!
Good one! Check the site chat on Steam, you might find other mappers to help you fix that issue. Smart people are always receptive. 
I tried typing those things in the console and still everything is pitch black. I'd really like to finish the map. Any sugs?
It's not required to finish the map; it just makes the pillars stand out from the black.
Keep looking around and you'll find the answer. I made it so that places that are no longer useful seal off, so don't be afraid to double check somewhere you've already been.
I have been stuck trying to find the second to last room for an hour, the only rooms I can get to are the color room, black maze room and the room with 4 windows. There is no office just goes back to the color room. I don't get it?
Figured it out, I like the subtle hint. More light would help, you really don't need to hide anything with dim lighting.
"Mat_fullbright 1" might help in the fizzlers maze.
I had to set mat_fullbright 1 just to see
I wanted the map to feel really dim because some dreams are dark like that. However, I can see that form is starting to interfere with function, so I guess I'll just have to make it feel like a dream in a different way. That said, I am definitely going to make the map much brighter. In fact, I'm redoing the maze entirely and I think you'll like how it looks once I finish it...
Thanks again for your input!