Games like Prison Alone
Games like Prison Alone include What Remains of Edith Finch, Firewatch, Layers of Fear (2016), POOLS, and September 7th. We matched them by the tags players give Prison Alone on Steam (Walking Simulator, Psychological Horror, Exploration, Atmospheric, and Realistic): closest matches first, and among equally close ones the better-known games.

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

Firewatch
Shared: Walking Simulator · Atmospheric · Exploration

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

POOLS
Shared: Walking Simulator · Psychological Horror · Atmospheric

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

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

SOMA
Shared: Psychological Horror · Atmospheric · Horror

Mouthwashing
Shared: Psychological Horror · Atmospheric · Walking Simulator

Visage
Shared: Psychological Horror · Horror · Atmospheric

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

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

Scanner Sombre
Shared: Walking Simulator · Exploration · Atmospheric

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

Outlast
Shared: Psychological Horror · Atmospheric · First-Person

Fears to Fathom - Ironbark Lookout
Shared: Psychological Horror · Atmospheric · Exploration

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

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

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

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

Subliminal
Shared: Psychological Horror · Realistic · Atmospheric

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

ROUTINE
Shared: Psychological Horror · Atmospheric · Singleplayer

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

Don't Play This
Shared: Psychological Horror · Exploration · Walking Simulator