Games like Stardiver
Games like Stardiver include Outer Wilds, Deliver Us The Moon, Starfield, Firewatch, and Observation. We matched them by the tags players give Stardiver on Steam (Action-Adventure, Sci-fi, Indie, Space, and Mystery): closest matches first, and among equally close ones the better-known games.

Outer Wilds
Shared: Space · Mystery · Atmospheric

Deliver Us The Moon
Shared: Indie · Sci-fi · Space

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

Firewatch
Shared: Atmospheric · Mystery · Indie

Observation
Shared: Indie · Sci-fi · Space

The Talos Principle
Shared: Sci-fi · Atmospheric · Story Rich

Marvel's Guardians of the Galaxy
Shared: Action-Adventure · Sci-fi · Story Rich

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

In Other Waters
Shared: Indie · Atmospheric · Underwater

Tacoma
Shared: Sci-fi · Indie · Space

The Swapper
Shared: Sci-fi · Space · Atmospheric

No Man's Sky
Shared: Space · Sci-fi · Atmospheric

Prey
Shared: Sci-fi · Space · Atmospheric

What Remains of Edith Finch
Shared: Atmospheric · Mystery · Story Rich

STAR WARS Jedi: Fallen Order™
Shared: Action-Adventure · Sci-fi · Story Rich

PRAGMATA
Shared: Sci-fi · Action-Adventure · Futuristic

Deliver Us Mars
Shared: Sci-fi · Space · Action-Adventure

The Callisto Protocol™
Shared: Sci-fi · Space · Action-Adventure

The Turing Test
Shared: Sci-fi · Space · Atmospheric

Metal Garden
Shared: Sci-fi · Atmospheric · Mystery

Breathedge
Shared: Space · Indie · Sci-fi

Cyberpunk 2077
Shared: Sci-fi · Story Rich · Singleplayer

The Invincible
Shared: Sci-fi · Futuristic · Space

Return of the Obra Dinn
Shared: Mystery · Indie · Atmospheric

