Games like Space Worthy
Games like Space Worthy include Kerbal Space Program, Elite Dangerous, Starbase, Kerbal Space Program 2, and Avorion. We matched them by the tags players give Space Worthy on Steam (Action, Simulation, Puzzle, Sandbox, and Space Sim): closest matches first, and among equally close ones the better-known games.

Kerbal Space Program
Shared: Simulation · Sandbox · Space Sim

Elite Dangerous
Shared: Space Sim · Simulation · Exploration

Starbase
Shared: Simulation · Space Sim · Sandbox

Kerbal Space Program 2
Shared: Sandbox · Simulation · Exploration

Avorion
Shared: Sandbox · Space Sim · Exploration

Hardspace: Shipbreaker
Shared: Simulation · Sandbox · Puzzle

Space Engineers
Shared: Sandbox · Simulation · Building

X4: Foundations
Shared: Simulation · Space Sim · Sandbox

EVE Online
Shared: Space Sim · Simulation · Exploration

Universe Sandbox
Shared: Simulation · Sandbox · Space Sim

X Rebirth
Shared: Simulation · Action · Space Sim

Spaceflight Simulator
Shared: Sandbox · Simulation · Space Sim

Space Engineers 2
Shared: Sandbox · Simulation · Building

Brick Rigs
Shared: Sandbox · Simulation · Building

SPORE™
Shared: Sandbox · Simulation · Exploration

Empyrion - Galactic Survival
Shared: Simulation · Space Sim · Sandbox

Garry's Mod
Shared: Sandbox · Simulation · Building

Besiege
Shared: Simulation · Sandbox · Puzzle

SPORE™ Galactic Adventures
Shared: Action · Simulation · Sandbox

No Man's Sky
Shared: Exploration · Sandbox · Space

Arma 3
Shared: Action · Simulation · FPS

Dyson Sphere Program
Shared: Simulation · Sandbox · Building

Portal
Shared: Puzzle · Puzzle Platformer · Action

BeamNG.drive
Shared: Simulation · Sandbox · Destruction