I finished it and it is really nice. I see architecture, shadow, and a unique layout. Seems like its routed well. Hey I wanted to say that where you get the blue key (also the area you used as the levels picture) it is a catacomb remind me of Turok with these green temple like textures to.
Yeah actually that is very right that is a catacomb it is exactly what it is

Also, is it just me or does this texture look like the Campaigner's face? Its not actually a door texture but I made it work because of that lol.

Also, just updated the map with fixed switches and color coordinated torches (to help know which door is which).