This is the Director's cut or version 2.0, it has some fixes, new edits and co-op option included, it's not Gzdoom, not Zandronum, not Zdoom or whatever, it's Skulltag, but it probably works with zandronum too if you have the right contents included from Skulltag.
map edit 17.5.2020, enemy was forgotten to include in easy skill that opens a scripted door, that is now fixed.
edit 28.6.2020: during first multiplayer testrun teleport issue
was found from first section of map and midway of map when you defeat two sub-bosses.
now are fixed.
This is awesome !
Skulltag is dead, bro.
I know.