Games like Crimson Mansion
Games like Crimson Mansion include Firewatch, What Remains of Edith Finch, Outer Wilds, Blue Prince, and The Stanley Parable. We matched them by the tags players give Crimson Mansion on Steam (Adventure, Puzzle, Walking Simulator, Multiple Endings, and Story Rich): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · Story Rich

What Remains of Edith Finch
Shared: Walking Simulator · Story Rich · Adventure

Outer Wilds
Shared: Adventure · Exploration · Story Rich

Blue Prince
Shared: Puzzle · Exploration · Mystery

The Stanley Parable
Shared: Walking Simulator · Adventure · Psychological

Riven
Shared: Adventure · Puzzle · Exploration

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

The Talos Principle
Shared: Puzzle · Story Rich · Singleplayer

Return of the Obra Dinn
Shared: Puzzle · Story Rich · Mystery

The Witness
Shared: Puzzle · Exploration · Singleplayer

The Beginner's Guide
Shared: Walking Simulator · Story Rich · Adventure

Call of the Sea
Shared: Adventure · Puzzle · Story Rich

OneShot
Shared: Story Rich · Puzzle · Adventure

INFRA
Shared: Puzzle · Adventure · Walking Simulator

The Forgotten City
Shared: Adventure · Exploration · Story Rich

Murders on the Yangtze River
Shared: Puzzle · Adventure · Story Rich

The Room Three
Shared: Puzzle · Adventure · Mystery

The Room
Shared: Puzzle · Adventure · Singleplayer

The Painscreek Killings
Shared: Puzzle · Story Rich · Exploration

The Room 4: Old Sins
Shared: Puzzle · Adventure · Mystery

Fallout 4
Shared: Adventure · Singleplayer · Exploration

Obduction
Shared: Adventure · Puzzle · Exploration

Layers of Fear (2016)
Shared: Walking Simulator · Adventure · Singleplayer

Spirit of the North
Shared: Adventure · Puzzle · Exploration