I like the concept for this map a black mesa theme wouldn't seem too out of place in csgo.
I was able to figure out the layout pretty quickly due to the map being rather small.
Big things I noticed:
+ Cool 3D skybox
+ Good use of custom textures
- The walls are a little too short, allowing people to see over them with when jumping or even standing. (some of your clip brushes didn't cover the whole crate, and I could hop on the hinges.
Small Things to iron out:
-Barrels clip into each other at B
-CT start road can clearly be seen leading to nothing.
-Ramps are a lil steep
-Crate clipping as mentioned before.
-more detail.

Otherwise, I like the feeling of this map, and with a bit of extra work, this could really go somewhere.

My rating: [6.2/10] {"Hey, not bad!}