WRATH: Aeon of Ruin https://store.steampowered.com/app/1000410/WRATH_Aeon_of_Ruin/
(Multiplayer on the dev roadmap)

SPRAWL https://store.steampowered.com/app/1549690/SPRAWL/
(planned pvp multiplayer https://steamcommunity.com/app/1549690/discus...191181470/)

Prodeus https://store.steampowered.com/app/964800/Prodeus/
(planed multiplayer https://steamcommunity.com/app/964800/discuss...609068508/)

Ion Fury https://store.steampowered.com/app/562860/Ion_Fury/
(Multiplayer mentioned on the last line of the description on Gog https://www.gog.com/game/ion_fury)

Graven (Co-op) https://store.steampowered.com/app/1371690/GRAVEN/

Postal: Brain Damaged https://store.steampowered.com/app/1359980/POSTAL_Brain_Damaged/

Kingpin: Reloaded https://store.steampowered.com/app/1224700/Kingpin_Reloaded/

Anomalous
https://www.youtube.com/watch?v=Mq_l7YaAKAo

DUSK https://store.steampowered.com/app/519860/DUSK/
(game from 2018 with DuskWorld multiplayer)

AMID EVIL https://store.steampowered.com/app/673130/AMID_EVIL/
(game from 2019)

Witchfire https://www.youtube.com/watch?v=-KMaDFKeMRU
(kinda looter shooter https://en.wikipedia.org/wiki/Witchfire_(video_game))

Shadow Warrior 3
https://store.steampowered.com/app/1036890/Shadow_Warrior_3/

Brutal Fate (thanks @Ian215)
https://store.steampowered.com/app/1409460/Brutal_Fate/

HROT (thanks @cloned)
https://store.steampowered.com/app/824600/HROT/

ULTRAKILL
https://store.steampowered.com/app/1229490/ULTRAKILL/

Core Decay (thanks @Niel_1)
https://store.steampowered.com/app/1260940/Core_Decay/

Nightmare Reaper (thanks @Niel_1)
https://store.steampowered.com/app/1051690/Nightmare_Reaper/

Hedon
https://store.steampowered.com/app/1072150/Hedon/

Project Warlock
https://store.steampowered.com/app/893680/Project_Warlock/

Viscerafest (thanks @Niel_1)
https://store.steampowered.com/app/1406780/Viscerafest/

Hellbound
https://store.steampowered.com/app/753590/Hellbound/

+ Doom 2016/Eternal, Wolfensteins...

It's time for Quake 1 remake ;)