Games like Quod: Episode 1
Games like Quod: Episode 1 include SOMA, What Remains of Edith Finch, Firewatch, Layers of Fear (2016), and Mouthwashing. We matched them by the tags players give Quod: Episode 1 on Steam (Horror, Walking Simulator, Puzzle, Hidden Object, and Atmospheric): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Horror · Atmospheric · Story Rich

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

Firewatch
Shared: Walking Simulator · Atmospheric · Story Rich

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

Mouthwashing
Shared: Horror · Atmospheric · Story Rich

Outer Wilds
Shared: Exploration · Puzzle · Atmospheric

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

The Exit 8
Shared: Walking Simulator · Puzzle · Horror

Still Wakes the Deep
Shared: Horror · Walking Simulator · Atmospheric

The Room Two
Shared: Puzzle · Horror · Hidden Object

Little Nightmares
Shared: Horror · Atmospheric · Puzzle

Fran Bow
Shared: Horror · Puzzle · Story Rich

Layers of Fear 2 (2019)
Shared: Horror · Walking Simulator · Atmospheric

MiSide
Shared: Horror · Story Rich · Atmospheric

INFRA
Shared: Puzzle · Walking Simulator · Atmospheric

ROUTINE
Shared: Atmospheric · Horror · Sci-fi

Little Nightmares II
Shared: Horror · Puzzle · Atmospheric

The Room
Shared: Puzzle · Atmospheric · Hidden Object

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

Lethal Company
Shared: Horror · First-Person · Exploration

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

Scanner Sombre
Shared: Walking Simulator · Horror · Atmospheric

Inside the Backrooms
Shared: Horror · Puzzle · Atmospheric

Sally Face - Episode One
Shared: Horror · Puzzle · Indie