honestly i didnt find it very hard at all, even on nightmare skill
just played through it, took me 10mins with only 1death at the part where the ogre comes out of the trapdoor behind you after pressing the switch
fun map though, but short-ish... but you managed to make your map action-packed without resorting to dick-move traps....
the fiend in the narrow corridor with arches wasnt a very good choice though....
the tight enclosed space made the fiend defenseless cuz he constantly bumps his head when jumping at the player making the fight easy as pie
the water-trap was to obvious what you had to do and i ended up not finding the trap dangerous at all because of that
you also gave the player grenade-luancher waay early which made most of the fights to easy.
especially the shalraths were made easy to deal with by the fact the grenade-launcher was available right from the start
you perhaps couldve also swapped some of the knights out for hellknights on harder difficulties,
that wouldve helped to keep the map from feeling to easy on the higher difficulties
overall: short but action-packed fun map.... but the tight narrow spaces actually kinda work AGAINST the map here i guess