Found this after 7 years thanks to the discussion in the "evolution of the quake map" thread. Can't believe I missed it back then. Pretty map and nice mood! Good fun for a solid 45+ minutes on easy with all kills, 7/20 secrets. First play demo (protocol 666) here: http://www.quaketastic.com/files/demos/apsp3_mandel.7z 

I downloaded this last year but I finally remembered to play through it thanks to Mandel. I gotta say that I really loved the atmosphere of this map. The architecture, layout, and lighting all worked together really well. It was bleak yet cozy at the same time.

The sense of progression was rewarding. I liked that you had the player breaking down the rune doors in order to access new areas. The floor breaking up and guiding the player into one of the final areas was an excellent touch as well.

The combat is a lot less hectic than what I've become accustomed too after playing so many recent releases. I actually enjoyed the slower pace for a change. It allowed me some time to appreciate the finer details. The layout was really something else. Even after beating it, I can't really form a good mental image of the layout but that didn't stop me from going where I needed to go. I never really got lost but there were times where I was afraid to jump down to certain areas because I was concerned that I wouldn't be able to find my way back to the new area from which I was jumping.

Skill 2, 222/222 kills but only 5/20 secrets. I loved the atmosphere in this map so much that I will be revisiting it and searching for some more secrets.