OH wow, wasn't expecting anyone to actually make a video of my map, that's great! I have edited the first post to include my own game play video, and i have uploaded a new version of the map which includes the texture fixes voxel made, custom music track, and I lowered the amount of archviles in that last room from 5 to 3. Also there is infact 1 secret in this map, but i forgot to tag it as a secret on the original version, this is fixed now.
I realize the bfg is kinda in a bad spot, my original idea was you could lure the archviles out, then circle back to get the bfg later. Didn't work out.