Games like Darko
Games like Darko include Phasmophobia, Poppy Playtime, Pacify, Sally Face - Episode One, and Firework. We matched them by the tags players give Darko on Steam (Horror, Psychological Horror, Exploration, 1990's, and Hand-drawn): closest matches first, and among equally close ones the better-known games.

Phasmophobia
Shared: Horror · Psychological Horror · Supernatural

Poppy Playtime
Shared: Horror · Psychological Horror · Dark

Pacify
Shared: Horror · Psychological Horror · Exploration

Sally Face - Episode One
Shared: Psychological Horror · Horror · Dark

Firework
Shared: Horror · Psychological Horror · Mystery

SOMA
Shared: Horror · Psychological Horror · Exploration

Buckshot Roulette
Shared: Horror · Dark · Psychological Horror

Escape the Backrooms
Shared: Horror · Psychological Horror · Exploration

Lethal Company
Shared: Horror · Exploration · Psychological Horror

Layers of Fear (2016)
Shared: Horror · Psychological Horror · Psychedelic

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

Inside the Backrooms
Shared: Horror · Psychological Horror · Exploration

Outlast
Shared: Horror · Psychological Horror · First-Person

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

DON'T SCREAM
Shared: Horror · Psychological Horror · Exploration

In Sound Mind
Shared: Horror · Psychological Horror · Action

Crow Country
Shared: Horror · Exploration · 1990's

Mouthwashing
Shared: Horror · Psychological Horror · Psychological

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

The Escape: Together
Shared: Horror · Exploration · Action

Amanda the Adventurer
Shared: Horror · 1990's · Mystery

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

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

Outlast 2
Shared: Horror · Psychological Horror · Dark