Maximum Matt

Yo man, I gotta give you a suggestion about an upcoming wad - OBTIC1 - that is designed to be played with special enemies and weapons.  https://doomwiki.org/wiki/Obituary
Obituary was created by The Innocent Crew (TiC), two brothers who previously made Slaughter Until Death (SUDTiC) which was on Maximum Doom as E2M1-9 of SLAUGHT.wad (which you can totally remember playing :-). 
Now as you know, Doom PWADs can insert new things into the game such as maps, textures, sounds, and music, but enemies and weapons are more hard-coded and more difficult to 'hack into' and change.  The 'official' version of OBTIC1 is apparently a bit difficult to install - it needs a separate editor to get it properly going in Vanilla Doom, but there may be a GZDoom mod available out there, or maybe you could get it going with your epic computer skills :-) 
The Maximum Doom version is totally playable, but not as intended, for example as some reviewers say here - the first level has a part where you fight too many hell knights in a cramped area with no ammo - the proper version converts these enemies into 'super imps' and is more manageable.   I know that you could probably grind through it, but I thought it would be cool to see it as originally intended, and fight some 'new' enemies for a change.  
Again, from what I understand, it's a bit of a pain to get it to run correctly, and playing the normal Max Doom version doesn't change the fact that you'll be going through all these new maps.  But on the other hand, it is on Doomworld's Top Ten 1995 Wads and considered a classic of it's era.  And besides, who doesn't wanna see a rocket trooper accidentally gib himself?!

https://onemandoom.blogspot.com/2011/04/obticwad-obituary.html