Games like Periapsis: Supporter Pack
Games like Periapsis: Supporter Pack include Kerbal Space Program, Stellaris, X4: Foundations, Universe Sandbox, and Hardspace: Shipbreaker. We matched them by the tags players give Periapsis: Supporter Pack on Steam (Simulation, Strategy, Space Sim, Space, and Physics): closest matches first, and among equally close ones the better-known games.
Kerbal Space Program
Shared: Simulation · Space · Physics
Stellaris
Shared: Strategy · Space · Simulation
X4: Foundations
Shared: Simulation · Space · Space Sim
Universe Sandbox
Shared: Simulation · Space Sim · Space
Hardspace: Shipbreaker
Shared: Simulation · Space · Physics
Elite Dangerous
Shared: Space Sim · Space · Simulation
Kerbal Space Program 2
Shared: Space · Exploration · Simulation
Dyson Sphere Program
Shared: Space · Simulation · Resource Management
Spaceflight Simulator
Shared: Space Sim · Simulation · Space
SPORE™
Shared: Simulation · Space · Exploration
Empyrion - Galactic Survival
Shared: Simulation · Space · Space Sim
Space Haven
Shared: Strategy · Simulation · Space
No Man's Sky
Shared: Space · Exploration · Procedural Generation
Cities: Skylines
Shared: Simulation · Strategy · Resource Management
Space Engineers
Shared: Simulation · Space · Physics
Oxygen Not Included
Shared: Resource Management · Simulation · Strategy
FTL: Faster Than Light
Shared: Strategy · Space · Simulation
X Rebirth
Shared: Simulation · Space · Space Sim
Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Physics
EVE Online
Shared: Space Sim · Exploration · Simulation
Solar Expanse - Space Exploration Manager
Shared: Simulation · Space · Physics
IXION
Shared: Strategy · Space · Simulation
SpaceEngine
Shared: Space · Space Sim · Casual
Universe Sandbox
Shared: Simulation · Space · Physics