Let me just say, this map is awesome. I have a coupple of ideas for you.
Besides the obvious stuff like staffs, texture updates, and lighting, I have some ideas. I have no idea if any of this is possible, but here we go. Feel free to add all or none of this stuff.

-Have there be an option to leave the vial hall. I got stuck there with no ammo and had to knife my way out.
-Some of the walls and floors are just flat walls. Maybe add some variance in them.
-Make it so you have to have a shovel to dig
-Maybe add some windows? Sometimes i found myself needing like 30 points at the end of a round.