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

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

What Remains of Edith Finch
Shared: Walking Simulator · Atmospheric · Story Rich

Firewatch
Shared: Atmospheric · Walking Simulator · Story Rich

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

SOMA
Shared: Horror · Psychological Horror · Atmospheric

Sally Face - Episode One
Shared: Psychological Horror · Horror · Story Rich

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

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

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

MiSide
Shared: Psychological Horror · Horror · Story Rich

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

Poppy Playtime
Shared: Horror · Psychological Horror · Dark

Little Nightmares II
Shared: Horror · Psychological Horror · Atmospheric

Visage
Shared: Horror · Psychological Horror · Dark

Phasmophobia
Shared: Horror · Psychological Horror · Supernatural

Little Nightmares
Shared: Horror · Atmospheric · Dark

Outlast
Shared: Horror · Psychological Horror · Atmospheric

Welcome to Kowloon
Shared: Horror · Psychological Horror · Atmospheric

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

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

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

Hellblade: Senua's Sacrifice
Shared: Atmospheric · Horror · Story Rich

Blair Witch
Shared: Horror · Psychological Horror · Walking Simulator

Alan Wake
Shared: Horror · Atmospheric · Story Rich