Games like ZonZon
Games like ZonZon include Lethal Company, Zort, The Exit 8, Backrooms: Escape Together, and Escape the Backrooms. We matched them by the tags players give ZonZon on Steam (Psychological Horror, Parody , Horror, Funny, and Realistic): closest matches first, and among equally close ones the better-known games.

Lethal Company
Shared: Horror · Psychological Horror · Funny

Zort
Shared: Horror · Psychological Horror · Funny

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

Backrooms: Escape Together
Shared: Horror · Psychological Horror · Realistic

Escape the Backrooms
Shared: Horror · Psychological Horror · First-Person

The Death | Thần Trùng
Shared: Psychological Horror · Horror · Realistic

Outlast
Shared: Horror · Psychological Horror · First-Person

[Chillas Art] The Convenience Store
Shared: Psychological Horror · Horror · Adventure

Fears to Fathom® - Scratch Creek
Shared: Horror · Psychological Horror · Walking Simulator

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

The Outlast Trials
Shared: Horror · Psychological Horror · First-Person

Ready or Not
Shared: Realistic · Horror · Psychological Horror

The Cabin Factory
Shared: Psychological Horror · Horror · Walking Simulator

Gorilla Tag
Shared: Psychological Horror · Funny · Horror

Visage
Shared: Psychological Horror · Horror · First-Person

Darkwood
Shared: Horror · Psychological Horror · Action

Fears to Fathom - Ironbark Lookout
Shared: Psychological Horror · Horror · Walking Simulator

SOMA
Shared: Psychological Horror · Horror · Atmospheric

Firewatch
Shared: Walking Simulator · Adventure · First-Person

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

MiSide
Shared: Psychological Horror · Horror · First-Person

Scanner Sombre
Shared: Horror · Walking Simulator · Psychological Horror

The Beast Inside
Shared: Horror · Psychological Horror · First-Person

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