Games like The Strange Lights
Games like The Strange Lights include Summer of '58, Mouthwashing, Firewatch, Fears to Fathom - Ironbark Lookout, and Layers of Fear (2016). We matched them by the tags players give The Strange Lights on Steam (Horror, Psychological Horror, Walking Simulator, Atmospheric, and Realistic): closest matches first, and among equally close ones the better-known games.

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

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

Firewatch
Shared: Atmospheric · Walking Simulator · Mystery

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

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

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

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

Poppy Playtime
Shared: Horror · Psychological Horror · Singleplayer

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

Phasmophobia
Shared: Horror · Psychological Horror · Supernatural

SOMA
Shared: Horror · Psychological Horror · Atmospheric

Outlast
Shared: Horror · Psychological Horror · Atmospheric

Subliminal
Shared: Psychological Horror · Realistic · Atmospheric

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

ROUTINE
Shared: Psychological Horror · Atmospheric · Horror

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

Visage
Shared: Horror · Psychological Horror · Atmospheric

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

MiSide
Shared: Psychological Horror · Horror · Atmospheric

Firework
Shared: Horror · Psychological Horror · Atmospheric

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

The Mortuary Assistant
Shared: Horror · Atmospheric · Supernatural

Welcome to Kowloon
Shared: Horror · Psychological Horror · Atmospheric

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