This one took me by surprise, even though I had secretly hoped that you would finish the whole remix project some day. First Quake release I've played in a couple of years, I think (with the exception of ionous' map). And totally worth it!
The levels are all very good, visually and in terms of gameplay. I enjoyed the episode a lot, the new maps, and going back through the older ones again after a few years.
What makes them so great as remakes/remixes is that they feature both recognizable elements from the originals (some very distinct, some rather abstract), yet add so much new in terms of layout and details that they feel like new and different levels altogether while still carrying a strong nostalgic vibe.
Gameplay and combat are fun, with a bit of exploration going on that never overstayed its welcome for me. Played on normal skill, never any problems with supplies and encounters, save for a few derps. Might be tighter when playing the maps from shotgun start. I enjoyed the secrets, too. Never found 100%, but still a good amount overall, including many of the unmarked ones.
Very cool adaption of q2dm1 and while it's not part of the original set, it still works well as a final map; proper desolate theme, visually willits if that's an actual adjective...
The secret level, which I did manage to find during my playtrough, is a strange excursion inbetween. It looks like a proto version of dm3rmx with elements from e1m1 and possibly a hint of scampsp1 - at least that's what it made me think of. More plain in style, and it kind of clashes with the rest of the levels; let alone its unrelated nature to the stock dm maps. Also felt odd playing yet another base map right afterwards. But it's a nice map nonetheless and luckily I managed to find all the buttons right before frustration could kick in.
I only briefly checked out deathmatch mode. Totally appreciated it's supported. Well, to be honest, I would've been disappointed if it hadn't. Could imagine it's a bit unbalanced in terms of item/weapon placement, and seemingly several layouts have some dead-ends that may prove counterproductive for more competitive deathmatches. Of course, the main goal was to provide a good singleplayer experience, so I'm not complaining. If there's a #tf session in them, I'm in.
Did the episode on stream even; no commentary though. The VOD should be available for another four or five days if you're interested.
https://www.twitch.tv/videos/1844532762