Awesome mod! It's just what I wanted, make Doom 2 fresh and challenging again. But I have some problems/suggestions: Once upon a time John Romero said that the first thing you see in a level is very important, it helps build a good first impression, but I was kinda disappointed with this: http://imgur.com/a/TRhdP.
The new enemy seems to be glitchy when I use this gameplay mod: https://www.doomworld.com/vb/wads-mods/69451-smooth-doom/
Also, the monster in the bathroom at the beginning of "The Waste Tunnels" is too Duke Nukem for my taste, but maybe that's just me.
Anyway, I hope this helps, keep up the good work!