Games like Terminal Breaker
Games like Terminal Breaker include Firewatch, The Beginner's Guide, What Remains of Edith Finch, Gone Home, and Layers of Fear (2016). We matched them by the tags players give Terminal Breaker on Steam (Casual, Walking Simulator, 3D, First-Person, and Atmospheric): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Walking Simulator · Atmospheric · First-Person

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

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

Gone Home
Shared: Walking Simulator · Atmospheric · First-Person

Layers of Fear (2016)
Shared: Walking Simulator · Atmospheric · First-Person

The Stanley Parable
Shared: Walking Simulator · First-Person · Indie

Cyberpunk 2077
Shared: Cyberpunk · First-Person · Story Rich

No, I'm not a Human
Shared: Atmospheric · First-Person · Indie

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

MiSide
Shared: First-Person · 3D · Story Rich

Mouthwashing
Shared: Atmospheric · Walking Simulator · Story Rich

Dishonored
Shared: First-Person · Atmospheric · Multiple Endings

Garten of Banban
Shared: First-Person · 3D · Singleplayer

INSIDE
Shared: Atmospheric · Dark · Story Rich

SOMA
Shared: Atmospheric · Dark · Story Rich

A Story About My Uncle
Shared: First-Person · Atmospheric · Casual

CARIMARA: Beneath the forlorn limbs
Shared: 3D · Story Rich · Walking Simulator

Among the Sleep - Enhanced Edition
Shared: Atmospheric · First-Person · Walking Simulator

Everybody's Gone to the Rapture
Shared: Walking Simulator · Atmospheric · Casual

Riven
Shared: First-Person · Atmospheric · 3D

>observer_
Shared: Cyberpunk · Atmospheric · Walking Simulator

Garten of Banban 2
Shared: First-Person · 3D · Dark

Five Nights at Freddy's: Security Breach
Shared: First-Person · 3D · Multiple Endings