Games like Ancestral
Games like Ancestral include Starfield, Indiana Jones and the Great Circle, Lethal Company, Amnesia: Rebirth, and Tainted Grail: The Fall of Avalon. We matched them by the tags players give Ancestral on Steam (Adventure, Action-Adventure, Exploration, Hidden Object, and First-Person): closest matches first, and among equally close ones the better-known games.

Starfield
Shared: Exploration · Sci-fi · Action-Adventure

Indiana Jones and the Great Circle
Shared: Action-Adventure · First-Person · Adventure

Lethal Company
Shared: First-Person · Exploration · Sci-fi

Amnesia: Rebirth
Shared: Action-Adventure · First-Person · Adventure

Tainted Grail: The Fall of Avalon
Shared: Adventure · First-Person · Dark Fantasy

Assassin's Creed® Odyssey
Shared: Action-Adventure · Exploration · Mythology

No Man's Sky
Shared: Exploration · Adventure · Sci-fi

Slime Rancher
Shared: Adventure · Exploration · First-Person

Outer Wilds
Shared: Exploration · Adventure · Sci-fi

Fallout 4
Shared: Exploration · Adventure · First-Person

SOMA
Shared: Exploration · Sci-fi · First-Person

Firewatch
Shared: Adventure · First-Person · Exploration

Pacify
Shared: Exploration · First-Person · Sci-fi

Five Nights at Freddy's: Secret of the Mimic
Shared: Adventure · First-Person · Exploration

Valley
Shared: Adventure · Exploration · First-Person

ROUTINE
Shared: Adventure · Sci-fi · First-Person

Black Myth: Wukong
Shared: Mythology · Action-Adventure · Adventure

What Remains of Edith Finch
Shared: Adventure · Exploration · First-Person

Escape the Backrooms
Shared: First-Person · Adventure · Exploration

Rise of the Tomb Raider™
Shared: Adventure · Exploration · Action-Adventure

Atomic Heart
Shared: Adventure · Action-Adventure · Sci-fi

STAR WARS Jedi: Survivor™
Shared: Adventure · Action-Adventure · Sci-fi

Dark Fracture: Prologue
Shared: Adventure · Exploration · First-Person

PEAK
Shared: Adventure · Exploration · First-Person