Games like FireAirPlan
Games like FireAirPlan include FTL: Faster Than Light, Kerbal Space Program, Door Kickers, X4: Foundations, and Plague Inc: Evolved. We matched them by the tags players give FireAirPlan on Steam (Simulation, Strategy, Space Sim, Shooter, and Top-Down Shooter): closest matches first, and among equally close ones the better-known games.
FTL: Faster Than Light
Shared: Strategy · Space · Indie
Kerbal Space Program
Shared: Simulation · Space Sim · Space
Door Kickers
Shared: Strategy · Simulation · Top-Down
X4: Foundations
Shared: Simulation · Space Sim · Space
Plague Inc: Evolved
Shared: Simulation · Strategy · Indie
House of the Dying Sun
Shared: Simulation · Space Sim · Space
Police Stories
Shared: Strategy · Simulation · Top-Down Shooter
Halo: Spartan Assault
Shared: Top-Down Shooter · Shooter · Strategy
Stellaris
Shared: Strategy · Simulation · Space
Cosmoteer: Starship Architect & Commander
Shared: Strategy · Space Sim · Space
Hardspace: Shipbreaker
Shared: Simulation · Space · Space Sim
Mini Motorways
Shared: Simulation · Strategy · Indie
Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Indie
Elite Dangerous
Shared: Space Sim · Simulation · Space
Game Dev Tycoon
Shared: Simulation · Strategy · Indie
X Rebirth
Shared: Simulation · Space Sim · Space
Space Engineers
Shared: Simulation · Space · Space Sim
911 Operator
Shared: Simulation · Strategy · Indie
Starpoint Gemini Warlords
Shared: Strategy · Simulation · Space
Between the Stars
Shared: Simulation · Strategy · Space
Empyrion - Galactic Survival
Shared: Simulation · Space · Space Sim
The Last Starship
Shared: Simulation · Strategy · Space
Dyson Sphere Program
Shared: Simulation · Space · Strategy
KovaaK's
Shared: Simulation · Shooter · Indie