Games like Nightmare Side: The Game
Games like Nightmare Side: The Game include Poppy Playtime, Phasmophobia, What Remains of Edith Finch, SOMA, and Pacify. We matched them by the tags players give Nightmare Side: The Game on Steam (Horror, Psychological, Mystery, First-Person, and Narrative): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · First-Person · Mystery

Phasmophobia
Shared: Horror · First-Person · Psychological Horror

What Remains of Edith Finch
Shared: Mystery · First-Person · Walking Simulator

SOMA
Shared: Horror · Dark · Psychological Horror

Pacify
Shared: Horror · First-Person · Exploration

Outlast
Shared: Horror · First-Person · Survival Horror

Amnesia: A Machine For Pigs
Shared: Horror · First-Person · Walking Simulator

Mouthwashing
Shared: Horror · Psychological · Psychological Horror

Lethal Company
Shared: Horror · First-Person · Exploration

Firewatch
Shared: Mystery · First-Person · Walking Simulator

Visage
Shared: Horror · First-Person · Dark

Layers of Fear (2016)
Shared: Horror · First-Person · Walking Simulator

Outlast 2
Shared: Horror · First-Person · Dark

The Park®
Shared: Horror · First-Person · Walking Simulator

Still Wakes the Deep
Shared: Horror · First-Person · Psychological Horror

Escape the Backrooms
Shared: Horror · First-Person · Psychological Horror

Inside the Backrooms
Shared: Horror · First-Person · Survival Horror

Slender: The Arrival
Shared: Horror · First-Person · Dark

No, I'm not a Human
Shared: Horror · Psychological Horror · Psychological

Buckshot Roulette
Shared: Horror · Dark · First-Person

DON'T SCREAM
Shared: Horror · First-Person · Psychological Horror

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

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

Fears to Fathom - Ironbark Lookout
Shared: Horror · Narrative · First-Person