Games like Overtime Anomaly
Games like Overtime Anomaly include Firewatch, What Remains of Edith Finch, Outer Wilds, Layers of Fear (2016), and Mouthwashing. We matched them by the tags players give Overtime Anomaly on Steam (Adventure, Psychological Horror, Mystery, Atmospheric, and Immersive Sim): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Atmospheric · Mystery

What Remains of Edith Finch
Shared: Atmospheric · Mystery · Adventure

Outer Wilds
Shared: Mystery · Adventure · Exploration

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

Mouthwashing
Shared: Psychological Horror · Atmospheric · Walking Simulator

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

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

INFRA
Shared: Atmospheric · Adventure · Exploration

POOLS
Shared: Psychological Horror · Atmospheric · Walking Simulator

The Forgotten City
Shared: Adventure · Mystery · Exploration

The Painscreek Killings
Shared: Mystery · Investigation · Atmospheric

SOMA
Shared: Psychological Horror · Atmospheric · Exploration

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

Quern - Undying Thoughts
Shared: Adventure · Mystery · Atmospheric

Subliminal
Shared: Psychological Horror · Atmospheric · Mystery

DREDGE
Shared: Adventure · Exploration · Mystery

The Vanishing of Ethan Carter
Shared: Mystery · Atmospheric · Adventure

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

Blue Prince
Shared: Mystery · Exploration · Adventure

Sally Face - Episode One
Shared: Psychological Horror · Adventure · Mystery

The Beginner's Guide
Shared: Atmospheric · Walking Simulator · Adventure

Raging Loop
Shared: Adventure · Mystery · Psychological Horror

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

Bright Lights of Svetlov
Shared: Adventure · Atmospheric · Walking Simulator