Games like Unknown Horizon
Games like Unknown Horizon include No Man's Sky, Elite Dangerous, Starfield, EVE Online, and Endless Sky. We matched them by the tags players give Unknown Horizon on Steam (Space, Adventure, Retro, Top-Down, and RPG): closest matches first, and among equally close ones the better-known games.
No Man's Sky
Shared: Space · Open World · Adventure
Elite Dangerous
Shared: Space · Open World · Simulation
Starfield
Shared: Space · RPG · Open World
EVE Online
Shared: Adventure · Space · Open World
Endless Sky
Shared: Space · Adventure · Sci-fi
ASTRONEER
Shared: Space · Survival · Open World
Empyrion - Galactic Survival
Shared: Space · Simulation · Survival
Rebel Galaxy
Shared: Space · Adventure · RPG
Starbound
Shared: Space · Adventure · Survival
Don't Starve Together
Shared: Survival · Adventure · Open World
Enshrouded
Shared: Survival · Adventure · Open World
Fallout 4
Shared: Adventure · RPG · Open World
Terraria
Shared: Survival · Adventure · 2D
Starcom: Nexus
Shared: Space · RPG · Adventure
X4: Foundations
Shared: Space · Simulation · Open World
SPORE™ Galactic Adventures
Shared: Space · Adventure · Simulation
Space Rangers HD: A War Apart
Shared: Space · Adventure · RPG
SPORE™
Shared: Space · Open World · Simulation
The Forest
Shared: Adventure · Survival · Open World
Keplerth
Shared: Adventure · Survival · Exploration
DYSMANTLE
Shared: Survival · Adventure · RPG
Outer Wilds
Shared: Space · Adventure · Exploration
Fallout: New Vegas
Shared: RPG · Open World · Adventure
Rust
Shared: Survival · Adventure · Open World