This might just be the best Doom 64 mod I've ever seen. It preserves everything, makes what isn't part of the game behave as it were and "restores" monsters previously unseen in Doom 64. If this doesn't sell you, I don't know what else will.
TIMESTAMPS:
00:00 - Intro
00:03 - Pistol
00:24 - Shotgun
00:47 - Super shotgun
01:04 - Chaingun
01:30 - Rocket launcher
02:00 - Plasma gun
02:18 - BFG9000
02:51 - Unmaker + upgrades
03:35 - New chaingunner sprites
04:09 - New shotgunner sprites
04:30 - New revenant sprites
04:55 - New archvile sprites
05:30 - New spider mastermind sprites
05:57 - Chainsaw
06:26 - Fist
07:06 - A look at the missing monsters
07:40 - Outro