Games like Firmament
Games like Firmament include Firewatch, Outer Wilds, What Remains of Edith Finch, Quern - Undying Thoughts, and Blue Prince. We matched them by the tags players give Firmament on Steam (Puzzle, Adventure, Exploration, Mystery, and Story Rich): closest matches first, and among equally close ones the better-known games.
Firewatch
Shared: Adventure · Story Rich · Mystery
Outer Wilds
Shared: Exploration · Mystery · Adventure
What Remains of Edith Finch
Shared: Story Rich · Mystery · Exploration
Quern - Undying Thoughts
Shared: Puzzle · Adventure · Mystery
Blue Prince
Shared: Puzzle · Exploration · Mystery
Riven
Shared: Puzzle · Adventure · Exploration
The Room 4: Old Sins
Shared: Puzzle · Adventure · Mystery
Obduction
Shared: Puzzle · Adventure · Exploration
The Painscreek Killings
Shared: Mystery · Puzzle · Exploration
INFRA
Shared: Puzzle · Exploration · Adventure
FAR: Lone Sails
Shared: Adventure · Exploration · Puzzle
Stray
Shared: Adventure · Exploration · Singleplayer
Murders on the Yangtze River
Shared: Puzzle · Adventure · Story Rich
Return of the Obra Dinn
Shared: Puzzle · Mystery · Story Rich
The House of Da Vinci
Shared: Puzzle · Mystery · Exploration
The Witness
Shared: Puzzle · Exploration · Singleplayer
Spirit of the North
Shared: Adventure · Puzzle · Exploration
Call of the Sea
Shared: Puzzle · Adventure · Story Rich
Chants of Sennaar
Shared: Puzzle · Adventure · Singleplayer
The Room
Shared: Puzzle · Mystery · Adventure
Syberia: The World Before
Shared: Adventure · Puzzle · Exploration
The Last Campfire
Shared: Puzzle · Adventure · Singleplayer
Myst
Shared: Puzzle · Adventure · Exploration
The Talos Principle
Shared: Puzzle · Story Rich · Singleplayer