I'm very happy to see ability to launch TNT Evilution, Plutonia Experiment and Master Level right from the main menu. Classic flashlight and launching custom maps from separate folders are also welcome additions.
Bug that makes No Rest For the Living play incorrect music is not fixed (
https://doomwiki.org/wiki/No_Rest_for_the_Living)
Classic Doom mod support seem to be broken to me. I tried to launch FATE02.WAD for Doom2 using launcher and .bat file with -file fate02.wad command-line parameter, and every time I went to map2 it was second level from regular doom2, not fate02.
I extracted all wads to base/wads folder. TNT and Plutonia work, but for Master Levels it says that it can't find expansion.
pk4toBFG program is disappointing. I thought it's a .resource file generator, and it turned out to be just a .zip extractor.
Looks like this version of the game has improved stability: earthquake scene from first level of Hallowed Mod doesn't crash the game like in RBDoom3BFG. The level still doesn't work correctly though due to disappearing parts of the geometry in that scene and lack of ability to call a script through worldspawn.