Games like The Spectrum Retreat
Games like The Spectrum Retreat include Layers of Fear (2016), Poppy Playtime, What Remains of Edith Finch, Firewatch, and Amnesia: The Dark Descent. We matched them by the tags players give The Spectrum Retreat on Steam (Puzzle, First-Person, Adventure, Indie, and Strategy): closest matches first, and among equally close ones the better-known games.

Layers of Fear (2016)
Shared: First-Person · Psychological Horror · Atmospheric

Poppy Playtime
Shared: Puzzle · First-Person · Horror

What Remains of Edith Finch
Shared: First-Person · Atmospheric · Adventure

Firewatch
Shared: Adventure · First-Person · Atmospheric

Amnesia: The Dark Descent
Shared: Puzzle · Psychological Horror · First-Person

Outlast
Shared: First-Person · Psychological Horror · Atmospheric

Inside the Backrooms
Shared: Puzzle · Psychological Horror · Adventure

Little Nightmares
Shared: Adventure · Puzzle · Atmospheric

Little Nightmares II
Shared: Adventure · Puzzle · Horror

Among the Sleep - Enhanced Edition
Shared: Indie · Adventure · First-Person

Hello Neighbor 2
Shared: Puzzle · Adventure · First-Person

Bendy and the Ink Machine
Shared: First-Person · Puzzle · Horror

The Room Two
Shared: Puzzle · Adventure · Atmospheric

MiSide
Shared: Psychological Horror · First-Person · Horror

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

Blair Witch
Shared: Adventure · First-Person · Indie

INFRA
Shared: Puzzle · First-Person · Adventure

SOMA
Shared: Psychological Horror · Atmospheric · Horror

Scorn
Shared: Puzzle · First-Person · Atmospheric

Scanner Sombre
Shared: Adventure · First-Person · Walking Simulator

The Death | Thần Trùng
Shared: Puzzle · Indie · Adventure

Detention
Shared: Indie · Puzzle · Psychological Horror

Garten of Banban
Shared: First-Person · Puzzle · Psychological Horror

The Room
Shared: Puzzle · Adventure · Atmospheric