Games like B-Line
Games like B-Line include Firewatch, What Remains of Edith Finch, Outer Wilds, The Witness, and Quern - Undying Thoughts. We matched them by the tags players give B-Line on Steam (Exploration, Adventure, Mystery, Walking Simulator, and Atmospheric): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Atmospheric · Walking Simulator

What Remains of Edith Finch
Shared: Mystery · Walking Simulator · Atmospheric

Outer Wilds
Shared: Exploration · Mystery · Adventure

The Witness
Shared: Exploration · Puzzle · Atmospheric

Quern - Undying Thoughts
Shared: Adventure · Mystery · Exploration

Gone Home
Shared: Exploration · Walking Simulator · Short

The Room
Shared: Mystery · Puzzle · Adventure

Blue Prince
Shared: Exploration · Mystery · Puzzle

Riven
Shared: Adventure · Exploration · Puzzle

Obduction
Shared: Adventure · Exploration · Puzzle

INFRA
Shared: Exploration · Atmospheric · Adventure

Stray
Shared: Adventure · Exploration · Atmospheric

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

The Beginner's Guide
Shared: Walking Simulator · Atmospheric · Adventure

FAR: Lone Sails
Shared: Adventure · Exploration · Atmospheric

Return of the Obra Dinn
Shared: Mystery · Puzzle · Atmospheric

NaissanceE
Shared: Exploration · Atmospheric · Walking Simulator

Kairo
Shared: Exploration · Puzzle · Atmospheric

Antichamber
Shared: Exploration · Puzzle · Adventure

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

The Room Two
Shared: Mystery · Puzzle · Atmospheric

The Exit 8
Shared: Exploration · Walking Simulator · Puzzle

The Room Three
Shared: Adventure · Mystery · Puzzle

The Stanley Parable
Shared: Walking Simulator · Adventure · Exploration