Mr. Decay, you won.
Currently playing with a mod called Dusted's Pandemonia, at a difficulty I made by myself (with the approval of Killer Kouhai for posting videos on YT). Basically it's Nightmare with AmmoFactor 1.5 instead of 2 and DamageFactor 1.0 instead of 0.7.
Just here to say: congratulations, I can't max your map at my difficulty (not even at simple Nightmare). This is the first time I really lost :(
Considering that the only way to barely win the map was to have a good RNG, to do all kills I'd need am ultra good RNG (i.e. hundreds of attempts that I won't do). I played it at UV difficulty, all kills and secrets, including those horrible marines, but Nightmare and my difficulty are literally impossible to max.
Edited extra note: yes, I also took that megasphere by rocket-jumping (I had enough health to rocket jump and the Soulsphere gave me the health to do a second jump)