this map is an early beta and some things may not work as intended so i'd like a bit of help from the community. If you have the time download the map and run around it. see if you can find any bugs that I haven't (it would be greatly appreciated) as I often miss things even though I check often.
Map definitely needs better brushwork, You've got an interesting layout going but I fear it might be too small. I'm not gonna school you on 3d skyboxes, as I think you realize what I'm talking about just by mentioning it.
The light is VERY dark, this is an issue. A map shouldn't be this dark even if you're going for a theme. If you wanna keep the themeatic look then I would experiment with the ambient settingand more lights.
It seems you've blocked up certain games from entry, I'm guessing this is due to the map being unfinished. If I were you I'd block it off in a more classical sense instead of a weird invisible brush that I can physically hit. But that's not very important.
I'll come back to rate this whenever you end up finishing it, but right now it's just kind of a mess. Granted it is in beta, but it just feels super early to release.