Games like Faith Requiem
Games like Faith Requiem include Firewatch, What Remains of Edith Finch, The Witness, Road 96: Mile 0, and Journey. We matched them by the tags players give Faith Requiem on Steam (Exploration, Walking Simulator, 3D, First-Person, and Relaxing): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Walking Simulator · Exploration · First-Person

What Remains of Edith Finch
Shared: Walking Simulator · Exploration · Story Rich

The Witness
Shared: Exploration · First-Person · Walking Simulator

Road 96: Mile 0
Shared: Exploration · Walking Simulator · 3D

Journey
Shared: Exploration · Walking Simulator · Relaxing

PowerWash Simulator
Shared: Relaxing · Casual · First-Person

Slime Rancher
Shared: Exploration · First-Person · Colorful

Slime Rancher 2
Shared: Relaxing · First-Person · Colorful

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

ABZU
Shared: Exploration · Relaxing · Casual

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

Riven
Shared: Exploration · First-Person · 3D

Submerged
Shared: Exploration · Walking Simulator · Relaxing

The First Tree
Shared: Walking Simulator · Exploration · Relaxing

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

Botany Manor
Shared: Exploration · Walking Simulator · First-Person

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

The Exit 8
Shared: Exploration · Walking Simulator · First-Person

Eastshade
Shared: Exploration · Relaxing · First-Person

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

Kona
Shared: First-Person · Exploration · Walking Simulator

Flower
Shared: Relaxing · Exploration · Casual

A Short Hike
Shared: Exploration · Relaxing · Casual

POOLS
Shared: Walking Simulator · Exploration · First-Person