Games like Stormworks: Space
Games like Stormworks: Space include Space Engineers, Kerbal Space Program, Garry's Mod, Kerbal Space Program 2, and Empyrion - Galactic Survival. We matched them by the tags players give Stormworks: Space on Steam (Simulation, Space, Sandbox, Building, and Open World): closest matches first, and among equally close ones the better-known games.

Space Engineers
Shared: Sandbox · Space · Building

Kerbal Space Program
Shared: Simulation · Space · Sandbox

Garry's Mod
Shared: Sandbox · Building · Multiplayer

Kerbal Space Program 2
Shared: Space · Sandbox · Building

Empyrion - Galactic Survival
Shared: Simulation · Space · Building

Elite Dangerous
Shared: Space · Simulation · Open World

ASTRONEER
Shared: Space · Multiplayer · Open World

Scrap Mechanic
Shared: Sandbox · Building · Open World

Brick Rigs
Shared: Sandbox · Building · Open World

No Man's Sky
Shared: Space · Open World · Exploration

Valheim
Shared: Open World · Building · Online Co-Op

Core Keeper
Shared: Open World · Sandbox · Multiplayer

7 Days to Die
Shared: Open World · Multiplayer · Building

Terraria
Shared: Sandbox · Multiplayer · Building

ICARUS
Shared: Multiplayer · Open World · Online Co-Op

BeamNG.drive
Shared: Simulation · Sandbox · Physics

Starbound
Shared: Sandbox · Space · Online Co-Op

Project Zomboid
Shared: Open World · Sandbox · Multiplayer

Stormworks: Build and Rescue
Shared: Sandbox · Building · Open World

Conan Exiles Enhanced
Shared: Open World · Building · Sandbox

Once Human
Shared: Open World · Multiplayer · Building

Avorion
Shared: Sandbox · Space · Building

Rust
Shared: Open World · Multiplayer · Building

SPORE™
Shared: Sandbox · Simulation · Open World