Games like ZAAM
Games like ZAAM include Firewatch, What Remains of Edith Finch, Outer Wilds, The Talos Principle, and Riven. We matched them by the tags players give ZAAM on Steam (Adventure, Simulation, First-Person, Walking Simulator, and Exploration): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · First-Person

What Remains of Edith Finch
Shared: Walking Simulator · First-Person · Adventure

Outer Wilds
Shared: Adventure · Exploration · Mystery

The Talos Principle
Shared: First-Person · Atmospheric · Adventure

Riven
Shared: Adventure · First-Person · Exploration

The Long Dark
Shared: Exploration · Adventure · First-Person

Gone Home
Shared: Walking Simulator · Exploration · First-Person

INFRA
Shared: Exploration · First-Person · Adventure

Blue Prince
Shared: Exploration · Mystery · First-Person

The Beginner's Guide
Shared: Walking Simulator · First-Person · Adventure

The Witness
Shared: First-Person · Exploration · Adventure

Quern - Undying Thoughts
Shared: Adventure · Exploration · Walking Simulator

Fallout 4
Shared: Adventure · Exploration · First-Person

Amnesia: A Machine For Pigs
Shared: Walking Simulator · First-Person · Atmospheric

Layers of Fear (2016)
Shared: Walking Simulator · First-Person · Atmospheric

Crime Scene Cleaner
Shared: Simulation · First-Person · Atmospheric

Return of the Obra Dinn
Shared: Mystery · Atmospheric · First-Person

The Vanishing of Ethan Carter
Shared: Walking Simulator · Adventure · First-Person

Killer Frequency
Shared: Adventure · Simulation · First-Person

The Forgotten City
Shared: Adventure · Exploration · Mystery

Obduction
Shared: Adventure · First-Person · Exploration

The Stanley Parable
Shared: First-Person · Walking Simulator · Adventure

The Suicide of Rachel Foster
Shared: Adventure · Walking Simulator · Atmospheric

SOMA
Shared: Atmospheric · Exploration · Story Rich