I had a quick run and there are a lot of things you should pay more attention to.
The texturing is bad. Don't use bump-maps as textures. That doesn't look good at all (like in your first screen). Also in a lot of places the textures aren't aligned correctly (like on the metal pillars on your 3rd screenshot).
You have no visible light-sources (except for the lava in one room). The light is just coming from nowhere (which is bad and illogical).
About the layout: There are too many too small corridors. There's hardly enough space to fight around. I also had a hard time to orient myself, because most of the corridors look the same (ok... there are different textures, but they're all square tubes). Give different rooms some elements which let the players recognize the room (like different lighting, some unique architectural elements etc.).
This map looks more like you've learned using Radiant with it, so leave it as it is and build another and better map
bleach->aneurysm->straledm5->dieselpower->space-fun->o-fun->runningman->runningman1on1->aggressor(conversion)->soylent->bloodprison->bluesky->ruiner->reslimed->strength
