Games like Oathbound
Games like Oathbound include The Talos Principle 2, Spirit of the North, Slime Rancher, The Witness, and Firewatch. We matched them by the tags players give Oathbound on Steam (Adventure, Casual, Puzzle, Walking Simulator, and 3D Platformer): closest matches first, and among equally close ones the better-known games.

The Talos Principle 2
Shared: Puzzle · Walking Simulator · Exploration

Spirit of the North
Shared: Adventure · Puzzle · Casual

Slime Rancher
Shared: Adventure · Exploration · Casual

The Witness
Shared: Puzzle · Exploration · Adventure

Firewatch
Shared: Adventure · Walking Simulator · Exploration

Big Walk
Shared: Puzzle · Adventure · Exploration

Riven
Shared: Adventure · Puzzle · Exploration

Monument Valley
Shared: Adventure · Puzzle · Casual

Supraland
Shared: Adventure · Exploration · Puzzle Platformer

The Exit 8
Shared: Puzzle · Walking Simulator · Exploration

The Unfinished Swan
Shared: Adventure · Puzzle · Exploration

Portal 2
Shared: Puzzle · Puzzle Platformer · First-Person

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

RiME
Shared: Adventure · Puzzle · Exploration

Portal
Shared: Puzzle · 3D Platformer · Puzzle Platformer

Call of the Sea
Shared: Adventure · Puzzle · Casual

What Remains of Edith Finch
Shared: Walking Simulator · Adventure · Exploration

Refunct
Shared: 3D Platformer · Casual · Puzzle Platformer

Murders on the Yangtze River
Shared: Adventure · Puzzle · Exploration

The Last Campfire
Shared: Adventure · Puzzle · 3D Platformer

Chained Together
Shared: Adventure · Casual · Puzzle Platformer

Viewfinder
Shared: Puzzle · Puzzle Platformer · Adventure

Submerged
Shared: Exploration · Walking Simulator · Casual

Outer Wilds
Shared: Adventure · Exploration · Puzzle