Games like Salvation Prophecy
Games like Salvation Prophecy include Starfield, Mass Effect (2007), Starpoint Gemini 2, Rebel Galaxy, and STAR WARS Jedi: Survivor™. We matched them by the tags players give Salvation Prophecy on Steam (Action, RPG, Simulation, Indie, and Space): closest matches first, and among equally close ones the better-known games.

Starfield
Shared: RPG · Space · Sci-fi

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

Starpoint Gemini 2
Shared: RPG · Simulation · Space

Rebel Galaxy
Shared: RPG · Space · Sci-fi

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

Warframe
Shared: Action · RPG · Third Person

鬼谷八荒 Tale of Immortal
Shared: Simulation · RPG · Singleplayer

Between the Stars
Shared: RPG · Action · Space

Mass Effect™ Legendary Edition
Shared: RPG · Sci-fi · Action

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

STAR WARS™ Knights of the Old Republic™
Shared: RPG · Sci-fi · Singleplayer

Endless Sky
Shared: Space · Simulation · Sci-fi

Deliver Us The Moon
Shared: Action · Indie · Space

Space Pirates And Zombies 2
Shared: Action · Space · RPG

Mount & Blade II: Bannerlord
Shared: RPG · Action · Simulation

Starpoint Gemini Warlords
Shared: RPG · Space · Simulation

Angels Fall First
Shared: Action · Indie · Sci-fi

SPORE™ Galactic Adventures
Shared: Action · Simulation · Space

Elite Dangerous
Shared: Space · Simulation · Sci-fi

Star Trek Online
Shared: RPG · Sci-fi · Space

Dead Space (2008)
Shared: Action · Sci-fi · Space

Space Pirates and Zombies
Shared: Action · Space · Indie

Middle-earth: Shadow of War
Shared: Action · RPG · Singleplayer

FTL: Faster Than Light
Shared: Space · Indie · Sci-fi