I played it and beat it on HMP with an obscene amount of savescumming (and checking some linedefs out in an editor, which I suppose is cheating). Overall, it's a pretty good layout, but I swear it's way too hard.
Well, actually, this could be alleviated somewhat with more armor; there's literally two places you get it - a green armor tucked away in a secret room with a lot of chaingunners, and a single Megasphere that gives you a blue armor as a matter of course. However, you can only reach the green armor through a series of well-hidden secrets, and the Megasphere is fairly late into the map, so I spent a lot of time being two-shot by Revenant missiles that took out 80% of my health in one go. I mean, really, this map loves it some Revenants and Chaingunners (kind of Plutonia-esque, in that sense). Yeah, there's a fair bit of health to try and make up for this, but I dunno, it doesn't really feel the same.
Also, I noticed there were two red keys. One could be obtained with the blue key; the other was in an open area with platforms that seemed to lower when I hit those face switches scattered about in various corners of the map (had to jump to reach this one in GZDoom, but I'm assuming that in vanilla, due to actors being infinitely tall, you can just grab it normally?). I'm guessing the idea here is that you just grab whichever and tada, you can leave the stage? (Given that both trigger the monsters teleporting in near the exit, anyway.)
Lastly, I'm assuming there's a trick to that opening segment, because I could only telefrag a Baron or two; once I reached the Revenant, I didn't really have any recourse but to take the teleporter with the super shotgun, because I simply couldn't get the timing down for the telefrag (doesn't help that it teleports me away from him), and like hell I'm taking a Revenant down with just 50 pistol bullets.