Games like Unfound Footage
Games like Unfound Footage include Mouthwashing, Poppy Playtime, Firewatch, No, I'm not a Human, and Layers of Fear (2016). We matched them by the tags players give Unfound Footage on Steam (Adventure, Indie, Horror, Psychological Horror, and Retro): closest matches first, and among equally close ones the better-known games.

Mouthwashing
Shared: Horror · Psychological Horror · Indie

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

Firewatch
Shared: Adventure · Atmospheric · Mystery

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

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

Outlast
Shared: Horror · Psychological Horror · Atmospheric

What Remains of Edith Finch
Shared: Atmospheric · Adventure · Mystery

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

No one lives under the lighthouse Director's cut
Shared: Indie · Adventure · Horror

Little Nightmares
Shared: Adventure · Horror · Atmospheric

MiSide
Shared: Psychological Horror · Horror · First-Person

Blair Witch
Shared: Adventure · Horror · Indie

Little Nightmares II
Shared: Adventure · Horror · Psychological Horror

Garten of Banban
Shared: Horror · Psychological Horror · First-Person

SOMA
Shared: Horror · Psychological Horror · Atmospheric

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

From The Darkness
Shared: Horror · Indie · Psychological Horror

Firework
Shared: Indie · Horror · Psychological Horror

Welcome to Kowloon
Shared: Horror · Adventure · Psychological Horror

The Room Three
Shared: Adventure · Indie · Mystery

The Room Two
Shared: Adventure · Horror · Mystery

Visage
Shared: Horror · Psychological Horror · Adventure

Slender: The Arrival
Shared: Horror · Indie · Psychological Horror

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