That was spot-on, thanks for the advice!
Ok, so I got to watching, wondering what the newest version of PrBoom+ had over the older versions. Didn't take long to notice the crisper, clearer textures when extended to 1600x900 resolution. Really did Lv21 justice, what a gorgeous level!! And then I switched to the Automap, expecting to see the usual plain-lines, basic colors level layout. How delightfully wrong I was... Floor textures beautifully rendered, perfectly scaled, and ooh - Even a 3D visual effect for those areas that have a "stairs" design layout! And the final, perfect touch... Moving "liquid" textures such as lava. Amazing. Then there's the properly-transparent water used on the waterfalls. Doom's never looked so good.
The demo itself had me glued to the screen, forgetting even to blink. Grimacing in sympathy when a rocket found its mark. Applauding the infight management, ammo conservation, weapon choices, and thorough monster-sweeping route. At the end, I was almost disappointed it was over, it was such a treat to watch.
TL;DR: Beautiful level, brilliant infights, and playing style to be proud of. Bloody well done, j4rio!!