Games like Atrium Mortis
Games like Atrium Mortis include Blue Prince, What Remains of Edith Finch, Outer Wilds, The Painscreek Killings, and Firewatch. We matched them by the tags players give Atrium Mortis on Steam (Puzzle, Investigation, Roguelite, First-Person, and Exploration): closest matches first, and among equally close ones the better-known games.

Blue Prince
Shared: Puzzle · Investigation · Roguelite

What Remains of Edith Finch
Shared: First-Person · Atmospheric · Exploration

Outer Wilds
Shared: Exploration · Puzzle · Mystery

The Painscreek Killings
Shared: Investigation · Puzzle · Exploration

Firewatch
Shared: Atmospheric · First-Person · Exploration

Layers of Fear (2016)
Shared: Psychological Horror · First-Person · Atmospheric

SOMA
Shared: Psychological Horror · Atmospheric · Exploration

INFRA
Shared: Puzzle · Exploration · First-Person

Poppy Playtime
Shared: Puzzle · First-Person · Psychological Horror

Quern - Undying Thoughts
Shared: Puzzle · Exploration · Atmospheric

The Exit 8
Shared: Puzzle · Exploration · Psychological Horror

Amnesia: A Machine For Pigs
Shared: First-Person · Atmospheric · Psychological Horror

The Witness
Shared: Puzzle · First-Person · Exploration

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

Inside the Backrooms
Shared: Puzzle · Psychological Horror · Exploration

MiSide
Shared: Psychological Horror · First-Person · Story Rich

Riven
Shared: Puzzle · First-Person · Exploration

Call of the Sea
Shared: Puzzle · First-Person · Story Rich

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

Phasmophobia
Shared: Psychological Horror · Investigation · First-Person

Garten of Banban
Shared: First-Person · Puzzle · Psychological Horror

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

Obduction
Shared: Puzzle · Exploration · First-Person

Amanda the Adventurer
Shared: Puzzle · First-Person · Mystery