Games like After the Empire
Games like After the Empire include Stellaris, FTL: Faster Than Light, X4: Foundations, Plague Inc: Evolved, and Kerbal Space Program. We matched them by the tags players give After the Empire on Steam (Strategy, Simulation, Indie, Space, and 4X): closest matches first, and among equally close ones the better-known games.

Stellaris
Shared: Strategy · Space · 4X

FTL: Faster Than Light
Shared: Strategy · Space · Indie

X4: Foundations
Shared: Simulation · Space · Strategy

Plague Inc: Evolved
Shared: Strategy · Simulation · Indie

Kerbal Space Program
Shared: Simulation · Space · Indie

ENDLESS Space™ - Definitive Edition
Shared: Strategy · Space · 4X

Europa Universalis IV
Shared: Strategy · Simulation · 4X

Game Dev Tycoon
Shared: Simulation · Strategy · Indie

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Indie

Oriental Empires
Shared: Strategy · Simulation · Indie

Distant Worlds: Universe
Shared: Strategy · Space · Simulation

Starpoint Gemini Warlords
Shared: Strategy · Space · Simulation

Distant Worlds 2
Shared: Strategy · Simulation · 4X

Spacebase DF-9
Shared: Simulation · Space · Strategy

Mini Motorways
Shared: Strategy · Simulation · Indie

Sins of a Solar Empire®: Rebellion
Shared: Simulation · Strategy · Space

Anno 2205™
Shared: Strategy · Simulation · 4X

Sins of a Solar Empire II
Shared: Strategy · Space · 4X

Space Pirates And Zombies 2
Shared: Strategy · Space · Indie

ENDLESS Space™ 2
Shared: Strategy · Space · 4X

Banished
Shared: Strategy · Simulation · Indie

911 Operator
Shared: Strategy · Simulation · Indie

Sid Meier’s Civilization® VI
Shared: Strategy · 4X · Simulation

StarDrive 2
Shared: Strategy · Indie · Space