Games like Interstice: Journey into Darkness
Games like Interstice: Journey into Darkness include Outlast, Poppy Playtime, Darkwood, Outlast 2, and SOMA. We matched them by the tags players give Interstice: Journey into Darkness on Steam (Horror, Dark, Psychological Horror, Atmospheric, and Action): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Atmospheric · Psychological Horror

Poppy Playtime
Shared: Horror · Dark · Psychological Horror

Darkwood
Shared: Horror · Psychological Horror · Dark

Outlast 2
Shared: Horror · Psychological Horror · Dark

SOMA
Shared: Horror · Psychological Horror · Atmospheric

Little Nightmares II
Shared: Horror · Dark · Adventure

The Outlast Trials
Shared: Horror · Psychological Horror · Survival Horror

Escape the Backrooms
Shared: Horror · Psychological Horror · Survival Horror

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

Choo-Choo Charles
Shared: Horror · Survival Horror · Dark

Little Nightmares
Shared: Horror · Atmospheric · Dark

Resident Evil Village
Shared: Horror · Survival Horror · Action

Garten of Banban
Shared: Horror · Psychological Horror · Dark

Resident Evil Requiem
Shared: Horror · Survival Horror · Action

Resident Evil 7 Biohazard
Shared: Horror · Survival Horror · Atmospheric

Visage
Shared: Horror · Psychological Horror · Dark

Slender: The Arrival
Shared: Horror · Dark · Psychological Horror

Lethal Company
Shared: Horror · Psychological Horror · Survival Horror

Inside the Backrooms
Shared: Horror · Psychological Horror · Survival Horror

SILENT HILL: Townfall
Shared: Horror · Psychological Horror · Action

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

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

Five Nights at Freddy's
Shared: Horror · Psychological Horror · Survival Horror

Phasmophobia
Shared: Horror · Psychological Horror · Dark