Games like The Horologist's Legacy
Games like The Horologist's Legacy include Buckshot Roulette, Mouthwashing, Outlast, No, I'm not a Human, and Layers of Fear (2016). We matched them by the tags players give The Horologist's Legacy on Steam (Indie, Horror, Psychological Horror, Psychological, and First-Person): closest matches first, and among equally close ones the better-known games.

Buckshot Roulette
Shared: Horror · Indie · First-Person

Mouthwashing
Shared: Horror · Psychological Horror · Indie

Outlast
Shared: Horror · First-Person · Psychological Horror

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

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

Visage
Shared: Horror · Psychological Horror · First-Person

From The Darkness
Shared: Horror · Psychological Horror · Indie

MiSide
Shared: Psychological Horror · Horror · First-Person

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

Slender: The Arrival
Shared: Horror · Indie · First-Person

Outlast 2
Shared: Horror · Psychological Horror · First-Person

Backrooms: Escape Together
Shared: Horror · Psychological Horror · Atmospheric

Phasmophobia
Shared: Horror · Psychological Horror · First-Person

Ready or Not
Shared: Realistic · Horror · Psychological Horror

Five Nights at Freddy's
Shared: Horror · Indie · Psychological Horror

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

Summer of '58
Shared: Horror · Psychological Horror · Atmospheric

SOMA
Shared: Horror · Psychological Horror · Atmospheric

The Outlast Trials
Shared: Horror · Psychological Horror · First-Person

Blair Witch
Shared: Horror · Indie · Psychological Horror

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

Welcome to Kowloon
Shared: Horror · Psychological Horror · Atmospheric

The Beginner's Guide
Shared: Indie · First-Person · Atmospheric

Fears to Fathom® - Scratch Creek
Shared: Horror · Psychological Horror · Indie