Very nice. Very, very nice! Totally blown away, impressive as always!
My 2 cents would be:
Im not feeling the sky connecting with the geometry. It feels disconnected.
The pit could do with some fx, It kills me, but its not obvious why. What Pat said could be the thing. Or maybe some more sound and an animated gradient effect from that central bit??? Its like a blast furnace or something right? mmm i dunno...
Those are my 2 nit picks. Such a strong map dude, Great sound and visual work... amazing! You better believe im gonna give those textures some loving after this comp is over. These are the tech textures ive been waiting for. lol
PS. The clipping in this screen shot is weird, it looks like i should be able to just walk across, but i get stuck here.