Games like Deeply Dark: Found Footage
Games like Deeply Dark: Found Footage include What Remains of Edith Finch, Firewatch, Layers of Fear (2016), SOMA, and Poppy Playtime. We matched them by the tags players give Deeply Dark: Found Footage on Steam (Psychological Horror, Mystery, Horror, Atmospheric, and Singleplayer): closest matches first, and among equally close ones the better-known games.

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

Firewatch
Shared: Atmospheric · Mystery · First-Person

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

SOMA
Shared: Psychological Horror · Horror · Atmospheric

Poppy Playtime
Shared: Horror · Singleplayer · Psychological Horror

Amnesia: A Machine For Pigs
Shared: Horror · Psychological Horror · Atmospheric

Mouthwashing
Shared: Psychological Horror · Horror · Atmospheric

MiSide
Shared: Psychological Horror · Horror · First-Person

No, I'm not a Human
Shared: Psychological Horror · Horror · Singleplayer

Garten of Banban
Shared: Horror · Psychological Horror · Singleplayer

Outlast
Shared: Horror · Psychological Horror · Atmospheric

Visage
Shared: Psychological Horror · Horror · First-Person

Outer Wilds
Shared: Mystery · Exploration · Atmospheric

Subliminal
Shared: Psychological Horror · Mystery · Atmospheric

DON'T SCREAM
Shared: Psychological Horror · Horror · Atmospheric

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

Anemoiapolis: Chapter 1
Shared: Psychological Horror · Horror · Mystery

Sally Face - Episode One
Shared: Psychological Horror · Horror · Mystery

POOLS
Shared: Psychological Horror · Atmospheric · Walking Simulator

Outlast 2
Shared: Psychological Horror · Horror · First-Person

Psalm 5:9-13
Shared: Psychological Horror · Horror · Mystery

The Park®
Shared: Psychological Horror · Horror · Singleplayer

The Complex: Expedition
Shared: Horror · Psychological Horror · Singleplayer

Garten of Banban 2
Shared: Horror · Psychological Horror · Singleplayer