Games like Decamped
Games like Decamped include Blue Prince, Firewatch, Outer Wilds, Indiana Jones and the Great Circle, and What Remains of Edith Finch. We matched them by the tags players give Decamped on Steam (Adventure, Puzzle, Story Rich, Exploration, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Blue Prince
Shared: Puzzle · Exploration · Investigation

Firewatch
Shared: Adventure · Story Rich · Singleplayer

Outer Wilds
Shared: Exploration · Adventure · Story Rich

Indiana Jones and the Great Circle
Shared: Story Rich · Puzzle · Adventure

What Remains of Edith Finch
Shared: Story Rich · Adventure · Exploration

Riven
Shared: Adventure · Puzzle · Exploration

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

Quern - Undying Thoughts
Shared: Adventure · Puzzle · Exploration

Portal 2
Shared: Puzzle · Singleplayer · Story Rich

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

The Talos Principle
Shared: Puzzle · Story Rich · First-Person

The Painscreek Killings
Shared: Puzzle · Investigation · Exploration

Myst
Shared: Adventure · Puzzle · Exploration

The Witness
Shared: Puzzle · Exploration · Singleplayer

Bugsnax
Shared: Adventure · Story Rich · Singleplayer

Kona
Shared: Adventure · Singleplayer · Story Rich

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

Amnesia: Rebirth
Shared: Puzzle · Story Rich · Adventure

The Talos Principle 2
Shared: Puzzle · Story Rich · Exploration

INFRA
Shared: Puzzle · Exploration · Adventure

Chants of Sennaar
Shared: Adventure · Puzzle · Singleplayer

Fallout 4
Shared: Adventure · Exploration · Singleplayer

Rise of the Tomb Raider™
Shared: Adventure · Singleplayer · Exploration

Tomb Raider Game of the Year
Shared: Adventure · Story Rich · Singleplayer