Games like Spacetime Dimension
Games like Spacetime Dimension include SPORE™, Universe Sandbox, Ultimate Epic Battle Simulator 2, Kerbal Space Program, and SpaceEngine. We matched them by the tags players give Spacetime Dimension on Steam (Casual, Simulation, Software, God Game, and Space Sim): closest matches first, and among equally close ones the better-known games.

SPORE™
Shared: God Game · Simulation · Casual

Universe Sandbox
Shared: Simulation · Space Sim · Sandbox

Ultimate Epic Battle Simulator 2
Shared: Simulation · God Game · Sandbox

Kerbal Space Program
Shared: Simulation · Space Sim · Sandbox

SpaceEngine
Shared: Casual · Space Sim · Sandbox

House Flipper
Shared: Simulation · Casual · Sandbox

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Strategy

DAVE THE DIVER
Shared: Casual · Simulation · Exploration

X4: Foundations
Shared: Simulation · Space Sim · Sandbox

Universe Sandbox
Shared: Simulation · Casual · Sandbox

EVE Online
Shared: Space Sim · Simulation · Exploration

Internet Cafe Simulator 2
Shared: Simulation · Exploration · Sandbox

Avorion
Shared: Space Sim · Sandbox · Exploration

PC Building Simulator
Shared: Simulation · Education · Sandbox

Elite Dangerous
Shared: Space Sim · Simulation · Exploration

Reus
Shared: God Game · Simulation · Casual

Chill Pulse
Shared: Casual · Simulation · Utilities

Slime Rancher
Shared: Exploration · Simulation · Casual

Goat Simulator
Shared: Simulation · Casual · Sandbox

WorldBox - God Simulator
Shared: Simulation · God Game · Sandbox

Two Point Museum
Shared: Casual · Simulation · Sandbox

SPORE™ Galactic Adventures
Shared: Simulation · Exploration · Sandbox

Simmiland
Shared: Simulation · God Game · Casual

Wobbly Life
Shared: Simulation · Casual · Sandbox