Games like Shelley's Haunted House
Games like Shelley's Haunted House include Firewatch, SOMA, Look Outside, Outlast, and Five Nights at Freddy's: Security Breach. We matched them by the tags players give Shelley's Haunted House on Steam (Survival Horror, Walking Simulator, Horror, Demons, and Adventure): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Walking Simulator · Adventure · Singleplayer

SOMA
Shared: Horror · Survival Horror · Exploration

Look Outside
Shared: Survival Horror · Horror · Adventure

Outlast
Shared: Survival Horror · Horror · Singleplayer

Five Nights at Freddy's: Security Breach
Shared: Survival Horror · Horror · Singleplayer

Five Nights at Freddy's: Into the Pit
Shared: Horror · Adventure · Singleplayer

Poppy Playtime
Shared: Horror · Survival Horror · Singleplayer

Visage
Shared: Survival Horror · Horror · Singleplayer

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

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

Little Nightmares
Shared: Horror · Adventure · Singleplayer

Darkwood
Shared: Survival Horror · Horror · Adventure

The Forest
Shared: Horror · Survival Horror · Adventure

Resident Evil 4
Shared: Survival Horror · Horror · Singleplayer

Mad Father
Shared: Horror · Survival Horror · Exploration

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

The Beast Inside
Shared: Horror · Survival Horror · Adventure

DAVE THE DIVER
Shared: Adventure · Casual · Pixel Graphics

Slender: The Arrival
Shared: Survival Horror · Horror · Walking Simulator

DISTRAINT: Deluxe Edition
Shared: Horror · Adventure · 2D

Resident Evil Village
Shared: Survival Horror · Horror · Singleplayer

Among the Sleep - Enhanced Edition
Shared: Horror · Adventure · Walking Simulator

Resident Evil 7 Biohazard
Shared: Survival Horror · Horror · Singleplayer

Bendy and the Dark Revival
Shared: Horror · Survival Horror · Singleplayer