With DooM Eternal, there's actually a fully running port of DooM and DooM II inside the game and jumping into that after playing the main game for a while feels incredibly seamless. DooM (2016) and DooM Eternal feel like they took the scary shotgun ballet of the originals and added verticality and modern game mechanics to it. The only thing I think they missed an opportunity on are the dark levels that were in the originals. Not every level in the original games was a full speed dance with demons.