Very nice design but bad gameplay. That bit where you go to an elevator that lifts you to an area that has 3 (!) fiends and 3 (!) vores attacking you at the same time... It is just impossible to survive that. So tell me, why making a level that's good throughout only to disappoint with a crap like that in the end? Ok, I can edit the "Monster_" lines in the map myself but...

Well, it's a map meant for speedrunning so the skill level can be very high.

Played on nightmare. All enemies annihilated. Found the secret. Played in a normal way (not by speed-running it).

A good fast paced map, simple but enough-quality brushwork, with a half-linear half-circled shaped layout, nice choice of textures, and intense and fair combats, in some parts it is needed to save ammo by monster infighting if you want to kill them all, for the rest there is enough. The secret is clearly made for speedrunners.

The last area Spacey mentions can be easy if you find the extra equipment. Even without that help it is doable but needs some attempts, but in nightmare if you don't take the help you'll need to use monster infighting if you want to kill them all, there isn't enough ammo.