Games like Evil Nightmares
Games like Evil Nightmares include SOMA, Mad Father, Sally Face - Episode One, OMORI, and Darkwood. We matched them by the tags players give Evil Nightmares on Steam (Horror, Psychological Horror, Exploration, 2D, and Mystery): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Horror · Psychological Horror · Story Rich

Mad Father
Shared: Horror · Psychological Horror · 2D

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

OMORI
Shared: Psychological Horror · Story Rich · Horror

Darkwood
Shared: Horror · Psychological Horror · Action

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

Mouthwashing
Shared: Horror · Psychological Horror · Story Rich

Outer Wilds
Shared: Exploration · Mystery · Story Rich

SILENT HILL 2
Shared: Horror · Psychological Horror · Story Rich

Urban Myth Dissolution Center
Shared: Psychological Horror · Mystery · 2D

Firework
Shared: Horror · 2D · Psychological Horror

Ib
Shared: Horror · Psychological Horror · 2D

Amnesia: A Machine For Pigs
Shared: Horror · Psychological Horror · Exploration

SILENT HILL f
Shared: Horror · Psychological Horror · Story Rich

What Remains of Edith Finch
Shared: Story Rich · Mystery · Exploration

ANIMAL WELL
Shared: Exploration · Horror · 2D

Outlast
Shared: Horror · Psychological Horror · Atmospheric

Poppy Playtime
Shared: Horror · Psychological Horror · Mystery

Alan Wake
Shared: Horror · Action · Story Rich

Firewatch
Shared: Mystery · Story Rich · Exploration

Fran Bow
Shared: Psychological Horror · Horror · Story Rich

Tiny Bunny
Shared: Horror · Psychological Horror · Story Rich

MiSide
Shared: Psychological Horror · Horror · Story Rich

The Evil Within 2
Shared: Horror · Psychological Horror · Story Rich