Games like Darker : Episode I
Games like Darker : Episode I include Gothic 1 Remake, Bramble: The Mountain King, Stray, Outer Wilds, and Spirit of the North. We matched them by the tags players give Darker : Episode I on Steam (Exploration, Adventure, Dark Fantasy, Gothic, and Casual): closest matches first, and among equally close ones the better-known games.

Gothic 1 Remake
Shared: Adventure · Exploration · Dark Fantasy

Bramble: The Mountain King
Shared: Adventure · Dark Fantasy · Atmospheric

Stray
Shared: Adventure · Exploration · Atmospheric

Outer Wilds
Shared: Exploration · Adventure · Atmospheric

Spirit of the North
Shared: Adventure · Exploration · Atmospheric

A Plague Tale: Requiem
Shared: Adventure · Exploration · Atmospheric

Monument Valley
Shared: Adventure · Exploration · Casual

Brothers - A Tale of Two Sons
Shared: Adventure · Atmospheric · Emotional

FAR: Lone Sails
Shared: Adventure · Exploration · Atmospheric

The Last Campfire
Shared: Adventure · Puzzle · Atmospheric

Journey
Shared: Adventure · Exploration · Atmospheric

COCOON
Shared: Adventure · Exploration · Puzzle

Chants of Sennaar
Shared: Adventure · Puzzle · Atmospheric

Riven
Shared: Adventure · Exploration · Puzzle

White Shadows
Shared: Adventure · Atmospheric · Exploration

The Midnight Walk
Shared: Adventure · Dark Fantasy · Atmospheric

Big Walk
Shared: Exploration · Adventure · Puzzle

Moncage
Shared: Adventure · Casual · Puzzle

What Remains of Edith Finch
Shared: Exploration · Atmospheric · Adventure

Murders on the Yangtze River
Shared: Adventure · Exploration · Puzzle

DARK SOULS™ III
Shared: Dark Fantasy · Exploration · Atmospheric

ABZU
Shared: Exploration · Adventure · Atmospheric

The House of Da Vinci
Shared: Exploration · Adventure · Puzzle

Firewatch
Shared: Adventure · Atmospheric · Exploration