Games like REliC
Games like REliC include Firewatch, What Remains of Edith Finch, Five Nights at Freddy's: Security Breach, Subnautica, and The Forest. We matched them by the tags players give REliC on Steam (Adventure, Walking Simulator, Exploration, First-Person, and Horror): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · First-Person

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

Five Nights at Freddy's: Security Breach
Shared: Horror · Singleplayer · First-Person

Subnautica
Shared: Horror · Exploration · Adventure

The Forest
Shared: Adventure · Horror · First-Person

Slime Rancher
Shared: Adventure · Exploration · First-Person

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

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

Scanner Sombre
Shared: Walking Simulator · Exploration · Adventure

The Long Dark
Shared: Exploration · Adventure · First-Person

Valley
Shared: Adventure · Exploration · First-Person

Fallout 4
Shared: Exploration · Adventure · Singleplayer

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

The Park®
Shared: Walking Simulator · Horror · First-Person

Kona
Shared: Adventure · First-Person · Singleplayer

Still Wakes the Deep
Shared: Horror · Walking Simulator · First-Person

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

INFRA
Shared: Exploration · Walking Simulator · Adventure

Killer Frequency
Shared: Adventure · Horror · Walking Simulator

Outlast
Shared: First-Person · Horror · Singleplayer

Subnautica 2
Shared: Exploration · Horror · Adventure

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

Lethal Company
Shared: First-Person · Horror · Exploration

Subnautica: Below Zero
Shared: Singleplayer · Exploration · Horror