Games like Trajectory
Games like Trajectory include The Invincible, Detroit: Become Human, Half-Life 2, Warhammer 40,000: Space Marine 2, and Deliver Us The Moon. We matched them by the tags players give Trajectory on Steam (Adventure, Action, Space, Sci-fi, and Dystopian ): closest matches first, and among equally close ones the better-known games.

The Invincible
Shared: Adventure · Sci-fi · Futuristic

Detroit: Become Human
Shared: Multiple Endings · Adventure · Choices Matter

Half-Life 2
Shared: Action · Sci-fi · Adventure

Warhammer 40,000: Space Marine 2
Shared: Action · Adventure · Sci-fi

Deliver Us The Moon
Shared: Adventure · Action · Space

PRAGMATA
Shared: Action · Sci-fi · Adventure

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

Road 96
Shared: Adventure · First-Person · Choices Matter

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

BioShock Infinite
Shared: Action · Adventure · First-Person

Starfield
Shared: Space · Sci-fi · Adventure

Call of Duty®: Infinite Warfare
Shared: Action · Space · Futuristic

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

Prey
Shared: Sci-fi · Space · Action

Atomic Heart
Shared: Adventure · Action · Sci-fi

The Wolf Among Us
Shared: Adventure · Multiple Endings · Action

Dishonored
Shared: Action · First-Person · Adventure

Outer Wilds
Shared: Space · Adventure · Sci-fi

Black Mesa
Shared: Action · Sci-fi · First-Person

LEGO® Star Wars™: The Skywalker Saga
Shared: Adventure · Space · Action

Call of Duty®: Black Ops III
Shared: Action · Futuristic · First-Person

STAR WARS™ Battlefront™ II
Shared: Space · Action · Sci-fi

Star Wars Outlaws
Shared: Action · Adventure · Sci-fi

Mass Effect (2007)
Shared: Action · Sci-fi · Space