The map isnt really good...
The layout is like a corridor with pillars and little sewer pipes on the floor, and basically Copy/Paste.
Is not playable in anyway, the geometry is fine but the middle isnt symetrical like the other parts of the map, the sewers pipes dont work, they are too narrow and isnt easy to exit from there.
The background dont fit with the ambience and looks ugly, dont make sence, in fact there is not background, just a square platform in a transparent circle, the lights are poor, the only significant lights are those that are in middle of the pillars (orange) and dont fit with the other parts of the map
The only good in this map are the textures that are normal, in conclusion: The map is unplayable, looks fine but the layouts spoil all, there is not background, the map is practically a box, the playerstart are badly positioned, just because it has a good concept, (the pillars, the fence, etc) ill give it a 4/10 for now, considering its a work in progress.

so im wondering what the square boxes in the skybox from the screenshot are about.

Interresting map...

The theme... What is it?

The texturing isn't great. I don't see any logical why you've used a trak5 texture to get something like the skyboxdome? It looks like a texture-error.

The geometry is bad and very unefficient. All structure consist out of several layers of geometry, while it doesn't even look that great. Maybe you should observate the pillars of akroseum to get a good view of a pillar with "kind of" low wtr.
Using a less wtr-consuming fence isn't a bad idea either...

The lighting isn't that great. It's pretty boring. The atmosphere kills all shadows and is very unrealistic.

The detailing is bad either. Almost everything is copy-paste work, wich kills realism.

The clip/noclip isn't great. Nothing to comment about that...

The flow trully sucks. You bump against pillars, get stuck into the sewers, etc. The map needs a complete remake to solve that.

The gameplay just get's killed by the flow. When the gameplay only takes very deep breathings, the long straight ways to each other's base kills the gameplay instantly.

I'm sorry to say it like this but overall, the map looks and plays bad. 2/10 for now...