I'm sorry this is a bit of a bump, but I have a few things to mention:
-I enjoyed this set a lot! Layout, texture, and music-wise. Though, I do have a few tiny gripes:
-This should have been called Back to Revenant X. It feels like Revenants are way overused, but despite that they weren't that much of a pain to deal with, except when they appear in swarms behind you in a few places (MAP06). I also wish the monsters were slower to be introduced instead of having them all mixed in within the first 7 maps or so. It makes the rest of the WAD a little less exciting.
-Suddenly archviles! They were okay in most places, but in one room (MAP06 again) where they're inside a room with tons of monsters, there isn't really a good way to dodge their attacks. It would be nice if there was a tiny bit more warning before most encounters, because they often come out of nowhere.
-There's quite a few hitscan enemies/revenants well outside of vertical FOV (bad for doom2.exe

)
-Health seems a bit stingy in about the first third or so but it could be that I suck

-I think the Yellow Key room in MAP06 is a bit bugged. I'm on r4220. There's a rocket box on top of a seemingly invisible wall, and there seems to be another to the right where the revenant is. What is it supposed to look like? Same deal in GZDoom, except there's quite a bit of z-fighting in that room as well (something I must say I haven't seen in Doom before)
-The train hubs were a nice little break/immersion bit, but they sortof lose their magic when you magically appear in the next map (and back) without there being a train at the destination
-The ending. Ain't it a shame?
I can't gripe about the map design because it's fantastic, and there are always clues/doors opening to show you where to go next, and I appreciated that a lot.
I agree that the maps do seem a tiny bit samey thematically, but I understand this is because this is all supposed to be Episode 1 so it doesn't bother me. Looking forward to E2!