Games like Null Hørizøn
Games like Null Hørizøn include Elite Dangerous, No Man's Sky, X4: Foundations, Kerbal Space Program, and 鬼谷八荒 Tale of Immortal. We matched them by the tags players give Null Hørizøn on Steam (Simulation, Space Sim, Exploration, Sandbox, and First-Person): closest matches first, and among equally close ones the better-known games.

Elite Dangerous
Shared: Space Sim · Exploration · Simulation

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

X4: Foundations
Shared: Simulation · Space Sim · Exploration

Kerbal Space Program
Shared: Simulation · Sandbox · Space Sim

鬼谷八荒 Tale of Immortal
Shared: Simulation · Sandbox · Management

Empyrion - Galactic Survival
Shared: Simulation · Exploration · Space

Stellaris
Shared: Exploration · Simulation · Space

X Rebirth
Shared: Simulation · Space Sim · Sandbox

Space Engineers
Shared: Sandbox · Simulation · Space

Spaceflight Simulator
Shared: Space Sim · Simulation · Sandbox

Hardspace: Shipbreaker
Shared: Simulation · Sci-fi · Space

Avorion
Shared: Space Sim · Exploration · Sandbox

The Long Dark
Shared: Exploration · First-Person · Simulation

EVE Online
Shared: Space Sim · Exploration · Simulation

Kerbal Space Program 2
Shared: Exploration · Sandbox · Simulation

Slime Rancher
Shared: Exploration · First-Person · Simulation

Supermarket Simulator
Shared: Simulation · First-Person · Management

Internet Cafe Simulator 2
Shared: Simulation · Exploration · First-Person

Breathedge
Shared: Sandbox · Space · First-Person

Oxygen Not Included
Shared: Simulation · Sandbox · Survival

A Game About Digging A Hole
Shared: Exploration · Sandbox · Simulation

Universe Sandbox
Shared: Simulation · Space Sim · Sandbox

Starfield
Shared: Exploration · Space · Sci-fi

RimWorld
Shared: Sandbox · Simulation · Survival