Welp, it was quite well done ;). Found that the layout was nice, and there was good use of non-standard texure combinations. Item wise there seemed to be too many 'distraction' items, like armour and health bonuses laying about. The health was ok overall, although after the pit of arachnotrons and that arch vile, a medkit or a few stimpacks at the exit would've been nice. I didnt take any damage from the archie, luckily, but if I had, I probably would have died (57 health, 12 armour at that time). Ammo was bountiful i found, the inclusion of the berserk was a good thing to have as well.
The outside detailing was superb, i found. Enough trees and corpse-laden monuments to make it appealing to the eye, and indoors was ok, but some things stood out, like small 8x8 objects for the player to snag on. Also might want to watch the flats of some of the floors. In the crate room (with hte boxes suspended above the monsters) near the place with the two rad suits the floors have little 8x8 squares of the wrong texture which are very noticable unless playing at 320x200.
Gameplay is good, with good cover in cramped places, and enough room to circle strafe when there was no cover, but the archviles need some sort of weakness. The first one is in that little cage, and unless the rocketlauncher or plasmagun is handy, the vile can kill you without fear of repent. Same situation with the one at teh end of the map, but worse because it has free movement. Some sort of cover would help without making the fight unfair.
All in all, I liked it :)