Games like The Haunted Tunnel
Games like The Haunted Tunnel include SOMA, Bendy and the Ink Machine, Firewatch, Mad Father, and Mouthwashing. We matched them by the tags players give The Haunted Tunnel on Steam (Survival Horror, Retro, Story Rich, Horror, and Walking Simulator): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Horror · Story Rich · Survival Horror

Bendy and the Ink Machine
Shared: Horror · Survival Horror · Puzzle

Firewatch
Shared: Story Rich · Adventure · Walking Simulator

Mad Father
Shared: Horror · Survival Horror · Story Rich

Mouthwashing
Shared: Story Rich · Horror · Retro

FAITH: The Unholy Trinity
Shared: Horror · Retro · Story Rich

Inside the Backrooms
Shared: Survival Horror · Horror · Puzzle

What Remains of Edith Finch
Shared: Story Rich · Walking Simulator · Adventure

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

Sally Face - Episode One
Shared: Story Rich · Horror · Adventure

Poppy Playtime
Shared: Horror · Survival Horror · Puzzle

Amnesia: A Machine For Pigs
Shared: Horror · Story Rich · Walking Simulator

Little Nightmares
Shared: Horror · Adventure · Story Rich

DISTRAINT: Deluxe Edition
Shared: Horror · Story Rich · Adventure

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

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

Outer Wilds
Shared: Story Rich · Adventure · Exploration

Darkwood
Shared: Survival Horror · Horror · Adventure

Look Outside
Shared: Survival Horror · Horror · Adventure

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

Resident Evil 2
Shared: Survival Horror · Horror · Story Rich

Resident Evil 4
Shared: Survival Horror · Horror · Story Rich

OneShot
Shared: Story Rich · Puzzle · Adventure

Little Nightmares II
Shared: Horror · Adventure · Story Rich