*If you like doom you may enjoy trying [ Cube 2 Sauerbraten ]Cube 2: Sauerbraten is a free multiplayer & singleplayer first person shooter, the successor of the Cube FPS. Much like the original Cube, the aim of this game is fun, old school deathmatch gameplay and also to allow map/geometry editing to be done cooperatively in-game. The engine supporting the game is entirely original in code & design, and its code is Open Source (ZLIB license, read the docs for more on how you can use the engine). that is inspired by doom.

alternatively: here is an additional more mainstream option to try,

Wolfenstein II: The New Colossus:

 America, 1961. The assassination of Nazi General Deathshead was a short-lived victory. The Nazis maintain their stranglehold on the world. You are BJ Blazkowicz, aka “Terror-Billy,” member of the Resistance, scourge of the Nazi empire, and humanity’s last hope for liberty.

Its a first-person shooter with a sci-fi/fantasy theme and a campaign that takes around 10-12 hours to complete. The game features fast-paced gunplay and a unique storyline that takes place in an alternate history where the Nazis won World War II. While it does have some horror elements, they are not overly creepy or disturbing.
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