Games like Astra Protocol 2
Games like Astra Protocol 2 include No Man's Sky, Elite Dangerous, X4: Foundations, Starfield, and X Rebirth. We matched them by the tags players give Astra Protocol 2 on Steam (Space Sim, Sci-fi, Space, Procedural Generation, and Stylized): closest matches first, and among equally close ones the better-known games.
No Man's Sky
Shared: Space · Sci-fi · Open World
Elite Dangerous
Shared: Space Sim · Space · Sci-fi
X4: Foundations
Shared: Space · Space Sim · Sci-fi
Starfield
Shared: Space · Sci-fi · Open World
X Rebirth
Shared: Sci-fi · Space · Space Sim
Cosmoteer: Starship Architect & Commander
Shared: Sci-fi · Space · Space Sim
FTL: Faster Than Light
Shared: Space · Sci-fi · Procedural Generation
Endless Sky
Shared: Space · Sci-fi · Open World
Empyrion - Galactic Survival
Shared: Space · Space Sim · Simulation
Kerbal Space Program
Shared: Space · Space Sim · Simulation
Rebel Galaxy
Shared: Space · Sci-fi · Space Sim
Stellaris
Shared: Space · Sci-fi · Exploration
Hardspace: Shipbreaker
Shared: Sci-fi · Space · Space Sim
SPORE™ Galactic Adventures
Shared: Space · Sci-fi · Simulation
V: Rings of Saturn
Shared: Sci-fi · Space · Space Sim
STAR WARS Jedi: Survivor™
Shared: Sci-fi · Open World · Space
SpaceEngine
Shared: Sci-fi · Space Sim · Space
Dyson Sphere Program
Shared: Space · Sci-fi · Open World
Starcom: Unknown Space
Shared: Space · Space Sim · Sci-fi
Kerbal Space Program 2
Shared: Space · Space Sim · Exploration
ASTRONEER
Shared: Space · Open World · Exploration
X3: Terran Conflict
Shared: Space · Sci-fi · Space Sim
Deliver Us The Moon
Shared: Space · Sci-fi · Space Sim
Outer Wilds
Shared: Space · Exploration · Sci-fi