Games like Ouija Rumours
Games like Ouija Rumours include Firewatch, What Remains of Edith Finch, Outer Wilds, The Exit 8, and Layers of Fear (2016). We matched them by the tags players give Ouija Rumours on Steam (Adventure, Simulation, Puzzle, Walking Simulator, and Exploration): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · Exploration

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

Outer Wilds
Shared: Adventure · Exploration · Puzzle

The Exit 8
Shared: Puzzle · Exploration · Walking Simulator

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

Scanner Sombre
Shared: Walking Simulator · Adventure · Exploration

SOMA
Shared: Horror · Exploration · Atmospheric

INFRA
Shared: Puzzle · Exploration · Adventure

Killer Frequency
Shared: Adventure · Puzzle · Simulation

Blue Prince
Shared: Puzzle · Exploration · Adventure

Platform 8
Shared: Adventure · Simulation · Walking Simulator

Amnesia: The Dark Descent
Shared: Puzzle · Gore · Horror

The Witness
Shared: Puzzle · Exploration · First-Person

Amnesia: A Machine For Pigs
Shared: Walking Simulator · Exploration · Horror

MiSide
Shared: First-Person · Horror · 3D

Inside the Backrooms
Shared: Puzzle · Adventure · Horror

Poppy Playtime
Shared: Puzzle · Horror · First-Person

Still Wakes the Deep
Shared: Walking Simulator · Gore · Adventure

Riven
Shared: Adventure · Puzzle · Exploration

Quern - Undying Thoughts
Shared: Adventure · Puzzle · Exploration

Psalm 5:9-13
Shared: Exploration · Indie · Walking Simulator

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

MOLE
Shared: Simulation · Adventure · Puzzle

The Vanishing of Ethan Carter
Shared: Walking Simulator · Adventure · Exploration