Games like Many Eyed
Games like Many Eyed include Outlast, SILENT HILL: Townfall, Darkwood, Layers of Fear (2016), and SOMA. We matched them by the tags players give Many Eyed on Steam (Action, Horror, Adventure, Atmospheric, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Atmospheric · Psychological Horror

SILENT HILL: Townfall
Shared: Horror · Action · Adventure

Darkwood
Shared: Horror · Adventure · Action

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

SOMA
Shared: Horror · Atmospheric · Psychological Horror

Total Chaos
Shared: Action · Horror · Adventure

Zort
Shared: Horror · Psychological Horror · Action

Little Nightmares II
Shared: Horror · Adventure · Atmospheric

The Beast Inside
Shared: Horror · Adventure · Action

The Outlast Trials
Shared: Horror · Psychological Horror · Action

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

Still Wakes the Deep
Shared: Horror · Psychological Horror · Walking Simulator

The Cabin Factory
Shared: Horror · Psychological Horror · Atmospheric

Pyromaniac
Shared: Action · Adventure · Psychological Horror

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

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

Visage
Shared: Horror · Psychological Horror · Atmospheric

Escape the Backrooms
Shared: Horror · Psychological Horror · Adventure

Firewatch
Shared: Adventure · Atmospheric · Walking Simulator

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · Adventure · Action

[Chillas Art] The Convenience Store
Shared: Horror · Adventure · Psychological Horror

Outlast 2
Shared: Horror · Psychological Horror · Atmospheric

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

Among the Sleep - Enhanced Edition
Shared: Horror · Adventure · Atmospheric