Games like Lost Item
Games like Lost Item include Firewatch, What Remains of Edith Finch, Layers of Fear (2016), Amnesia: A Machine For Pigs, and DON'T SCREAM. We matched them by the tags players give Lost Item on Steam (Horror, Walking Simulator, Psychological Horror, Hidden Object, and First-Person): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Walking Simulator · Adventure · First-Person

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

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

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

DON'T SCREAM
Shared: Horror · Psychological Horror · Walking Simulator

Outlast
Shared: Horror · First-Person · Psychological Horror

Visage
Shared: Horror · Psychological Horror · First-Person

Summer of '58
Shared: Horror · Psychological Horror · Walking Simulator

SOMA
Shared: Horror · Psychological Horror · Atmospheric

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

Mouthwashing
Shared: Horror · Psychological Horror · Walking Simulator

Platform 8
Shared: Psychological Horror · Walking Simulator · Hidden Object

The Exit 8
Shared: Walking Simulator · Horror · Psychological Horror

Scanner Sombre
Shared: Walking Simulator · Horror · Psychological Horror

Dollmare
Shared: Horror · Psychological Horror · First-Person

Psalm 5:9-13
Shared: Horror · Psychological Horror · Walking Simulator

From The Darkness
Shared: Horror · Psychological Horror · Walking Simulator

Welcome to Kowloon
Shared: Horror · Psychological Horror · Walking Simulator

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

September 7th
Shared: Horror · Walking Simulator · Psychological Horror

The Park®
Shared: Horror · Walking Simulator · Psychological Horror

No, I'm not a Human
Shared: Horror · Psychological Horror · First-Person

POOLS
Shared: Walking Simulator · Psychological Horror · Realistic

Subliminal
Shared: Psychological Horror · Realistic · Horror