Games like Caffeine
Games like Caffeine include Layers of Fear (2016), Blair Witch, Outlast, Firewatch, and Lethal Company. We matched them by the tags players give Caffeine on Steam (Adventure, Indie, First-Person, Horror, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

Layers of Fear (2016)
Shared: Horror · Psychological Horror · First-Person

Blair Witch
Shared: Adventure · Horror · Indie

Outlast
Shared: First-Person · Horror · Psychological Horror

Firewatch
Shared: Adventure · First-Person · Walking Simulator

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

The Beast Inside
Shared: Adventure · Horror · First-Person

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

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

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

Still Wakes the Deep
Shared: Horror · Psychological Horror · First-Person

Mouthwashing
Shared: Horror · Psychological Horror · Indie

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

Spooky's Jump Scare Mansion: HD Renovation
Shared: Indie · Adventure · Horror

Visage
Shared: Horror · Psychological Horror · First-Person

What Remains of Edith Finch
Shared: First-Person · Adventure · Walking Simulator

Observation
Shared: Adventure · Indie · Horror

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

Amnesia: A Machine For Pigs
Shared: Horror · First-Person · Walking Simulator

From The Darkness
Shared: Horror · Indie · Psychological Horror

MiSide
Shared: Psychological Horror · Horror · First-Person

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

Fears to Fathom - Woodbury Getaway
Shared: Adventure · Psychological Horror · First-Person

The Death | Thần Trùng
Shared: Horror · Indie · Adventure

Scanner Sombre
Shared: Adventure · Horror · Walking Simulator