Games like Horror Explus
Games like Horror Explus include MiSide, Firewatch, The Room Two, Mouthwashing, and Outlast. We matched them by the tags players give Horror Explus on Steam (Horror, Psychological Horror, Hidden Object, Atmospheric, and Immersive Sim): closest matches first, and among equally close ones the better-known games.

MiSide
Shared: Psychological Horror · Horror · Atmospheric

Firewatch
Shared: Atmospheric · Mystery · First-Person

The Room Two
Shared: Horror · Atmospheric · Hidden Object

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

Outlast
Shared: Horror · Psychological Horror · Atmospheric

Poppy Playtime
Shared: Horror · Psychological Horror · First-Person

DREDGE
Shared: Psychological Horror · Atmospheric · Mystery

No, I'm not a Human
Shared: Horror · Psychological Horror · Atmospheric

Layers of Fear (2016)
Shared: Horror · Psychological Horror · Atmospheric

SOMA
Shared: Horror · Psychological Horror · Atmospheric

Lethal Company
Shared: Horror · Psychological Horror · First-Person

What Remains of Edith Finch
Shared: Atmospheric · Mystery · First-Person

Outer Wilds
Shared: Mystery · Atmospheric · Exploration

Subliminal
Shared: Psychological Horror · Atmospheric · Horror

SILENT HILL 2
Shared: Horror · Psychological Horror · Atmospheric

Escape the Backrooms
Shared: Horror · Psychological Horror · First-Person

Phasmophobia
Shared: Horror · Psychological Horror · First-Person

Amnesia: A Machine For Pigs
Shared: Horror · Atmospheric · Psychological Horror

The Exit 8
Shared: Horror · Psychological Horror · Immersive Sim

Garten of Banban
Shared: Horror · Psychological Horror · First-Person

Inside the Backrooms
Shared: Horror · Psychological Horror · Atmospheric

Amnesia: The Bunker
Shared: Horror · Atmospheric · Immersive Sim

The Park®
Shared: Horror · Psychological Horror · Atmospheric

The Room
Shared: Atmospheric · Mystery · Hidden Object