Doom Wads/Mods #130:1 Monster
Concept wads.. People either love them or hate them, I try to stay in-between either good or bad wads, and honestely most I have tried I either play them a lot or I throw them into the recycle bin after I try them.. Concept Wads aren't like they use to be but they can be surprising by just a simple idea that forms a megawad like this 2007 release.
https://www.doomworld.com/idgames/levels/doom2/megawads/1monster
Requiring a sourceport, 1 Monster has 24 maps having exactly one monster type of each enemy (except map 10 which can be Pain Elementals and Lost Souls), The wad uses a lot of unique music including a midi version of Zombie by The Cranberries, This wad has some rough parts in the mapping yes but I think it's a good wad from a underwhelming year.
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There are 32,184 views in 547 videos for Doom II: Hell on Earth. His channel published over 2 days worth of content for the game, roughly 6.79% of Doom II: Hell on Earth content that Andrew Mullens has uploaded to YouTube.