Games like Particle Fleet: Emergence
Games like Particle Fleet: Emergence include FTL: Faster Than Light, Creeper World 3: Arc Eternal, Stellaris, Cosmoteer: Starship Architect & Commander, and STAR WARS™ Empire at War - Gold Pack. We matched them by the tags players give Particle Fleet: Emergence on Steam (Strategy, Indie, Simulation, Space, and RTS): closest matches first, and among equally close ones the better-known games.

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

Creeper World 3: Arc Eternal
Shared: Strategy · Indie · RTS

Stellaris
Shared: Strategy · Space · Sci-fi

Cosmoteer: Starship Architect & Commander
Shared: Space · Indie · Strategy

STAR WARS™ Empire at War - Gold Pack
Shared: Strategy · Space · RTS

Crying Suns
Shared: Strategy · Indie · Space

Papers, Please
Shared: Indie · Simulation · Pixel Graphics

Game Dev Tycoon
Shared: Indie · Simulation · Strategy

Homeworld Remastered Collection
Shared: Strategy · Space · RTS

The Escapists
Shared: Strategy · Simulation · Indie

Door Kickers
Shared: Strategy · Simulation · Indie

Battlevoid: Harbinger
Shared: Strategy · Simulation · Space

Plague Inc: Evolved
Shared: Strategy · Simulation · Indie

Distant Worlds: Universe
Shared: Strategy · Space · Simulation

AI War: Fleet Command
Shared: Strategy · Indie · Space

Nexus - The Jupiter Incident
Shared: Strategy · Space · Simulation

Infested Planet
Shared: Strategy · Indie · RTS

Spacebase DF-9
Shared: Simulation · Space · Strategy

Plants vs. Zombies GOTY Edition
Shared: Strategy · Tower Defense · Singleplayer

Sins of a Solar Empire II
Shared: Strategy · Space · RTS

The Escapists 2
Shared: Strategy · Simulation · Pixel Graphics

Rusted Warfare - RTS
Shared: Strategy · RTS · Indie

Kerbal Space Program
Shared: Simulation · Space · Indie

Oxygen Not Included
Shared: Strategy · Simulation · 2D