Yes, as others have said, this map has had many uploads under various guises. I remember playing it ages ago. It's large and pretty confusing/mazey at times. You have to be in the mood for confusing/mazey though if you want to enjoy it. It rates a bare "acceptable".
Done on HMP/continuous/saves.
A megawad with a lot of hot stuff in it. Aesthetics are nice, thematically as usual, starting with a bit of tech/factory/sewers, then getting deep into hell. Not much to say, the first episode has some mishmashes of colours that sometimes look weird, reminded me of JPCP (like that marble texture with blue triangles, here they come in yellow, red and green), while the second and third episodes look more serious, including Plutonia and gothic textures. There are a bunch of nice tracks to hear, though I spent more time hearing monsters everywhere than the music lol.
Action is reminiscent to Scythe. Also Vanguard (according to kmxexii) but I've only played the first one. In addition, there are a few notable guest maps, which contrast from Knox's style. So, basically maps are challenging and demanding. I really like how many of them are constructed like big arenas with lots of buildings, where action is inside and outside, makes good use of environment. Monster placement is well thought in general. Some maps have hectic starts, being surrounded by crossfire while looking for weapons (for pistol starts), followed by teleport ambushes, and some maps include different setpieces in tight rooms. There is an abundance of instapop traps, requiring a bit of foreknowledge to come out alive, though I don't recall any bullshit moments. Only map where I wasn't able to kill everything by myself was map 21, a secret is considerably mandatory to do that and I never found it. In other maps, a few monsters fail to teleport out of their rooms, or simply never wake up, making 100 percents impossible (map 23 is the worst case).
Secrets are mostly easy to find, with a few requiring to guess what a switch did or what triggers a tall pillar to lower (I see you map 26). It actually caught my attention that many maps have lots of secrets, since almost all of them short and arena-style. The exception is map 29, that has none, well it's a Joshy map so it's no big deal.
Oh yes, favourite maps, let's see: 02, 17, 19, 22 and 29. It's hard to pick favourites since I, more or less, liked them all in the same way. Only map I didn't like was 30, not only because it's IoS but progression is highly obscure (unlike any other map in the set), and it has a 3-times lift, fortunately it's slower so a safe rocket is always guaranteed.
Pretty satisfied with the mapset, recommended to anyone who liked Scythe and has a fetish for instapops (not that I have one...). My rate is 8/10.