Games like IFU
Games like IFU include SOMA, Little Nightmares II, Layers of Fear (2016), Firewatch, and What Remains of Edith Finch. We matched them by the tags players give IFU on Steam (Horror, Adventure, Thriller, Dark, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Horror · Psychological Horror · Dark

Little Nightmares II
Shared: Horror · Adventure · Dark

Layers of Fear (2016)
Shared: Horror · Psychological Horror · Walking Simulator

Firewatch
Shared: Adventure · Atmospheric · Walking Simulator

What Remains of Edith Finch
Shared: Walking Simulator · Adventure · Atmospheric

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

Little Nightmares
Shared: Horror · Adventure · Atmospheric

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

Fears to Fathom - Ironbark Lookout
Shared: Horror · Psychological Horror · Thriller

Poppy Playtime
Shared: Horror · Dark · Psychological Horror

ROUTINE
Shared: Psychological Horror · Adventure · Horror

MiSide
Shared: Horror · Psychological Horror · Story Rich

Summer of '58
Shared: Horror · Thriller · Psychological Horror

Still Wakes the Deep
Shared: Horror · Psychological Horror · Walking Simulator

Detention
Shared: Horror · Psychological Horror · Adventure

Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · Psychological Horror

Blair Witch
Shared: Horror · Adventure · Psychological Horror

Fears to Fathom - Norwood Hitchhike
Shared: Horror · Psychological Horror · Thriller

Inside the Backrooms
Shared: Horror · Psychological Horror · Adventure

Phasmophobia
Shared: Horror · Psychological Horror · Dark

Visage
Shared: Horror · Psychological Horror · Dark

Fran Bow
Shared: Horror · Psychological Horror · Adventure

Platform 8
Shared: Adventure · Psychological Horror · Walking Simulator

The Room Two
Shared: Horror · Adventure · Atmospheric