Games like experiment: one
Games like experiment: one include Lobotomy Corporation | Monster Management Simulation, No, I'm not a Human, Papers, Please, The Test, and The Quarry. We matched them by the tags players give experiment: one on Steam (Simulation, Horror, Story Rich, Multiple Endings, and Realistic): closest matches first, and among equally close ones the better-known games.

Lobotomy Corporation | Monster Management Simulation
Shared: Simulation · Story Rich · Horror

No, I'm not a Human
Shared: Horror · Story Rich · Singleplayer

Papers, Please
Shared: Simulation · Singleplayer · Indie

The Test
Shared: Simulation · Story Rich · Multiple Endings

The Quarry
Shared: Horror · Multiple Endings · Story Rich

People Playground
Shared: Gore · Simulation · Violent

Contraband Police
Shared: Simulation · Singleplayer · Realistic

Resident Evil 4
Shared: Horror · Story Rich · Singleplayer

Ready or Not
Shared: Realistic · Horror · Singleplayer

Five Nights at Freddy's: Security Breach
Shared: Horror · Singleplayer · Multiple Endings

Resident Evil Village
Shared: Horror · Singleplayer · Story Rich

Resident Evil 2
Shared: Horror · Singleplayer · Gore

The Test: Hypothesis Rising
Shared: Simulation · Horror · Multiple Endings

Resident Evil 7 Biohazard
Shared: Horror · Singleplayer · Gore

Undertale
Shared: Story Rich · Multiple Endings · Singleplayer

Tiny Bunny
Shared: Horror · Story Rich · Singleplayer

INSIDE
Shared: Horror · Story Rich · Singleplayer

Outlast 2
Shared: Horror · Singleplayer · Gore

Mouthwashing
Shared: Horror · Story Rich · Gore

MiSide
Shared: Story Rich · Horror · Singleplayer

Crime Scene Cleaner
Shared: Simulation · Singleplayer · Gore

Autopsy Simulator
Shared: Simulation · Horror · Gore

KinitoPET
Shared: Horror · Multiple Endings · Story Rich

Detroit: Become Human
Shared: Story Rich · Multiple Endings · Singleplayer