Games like Creeper World 3: Arc Eternal
Games like Creeper World 3: Arc Eternal include They Are Billions, FTL: Faster Than Light, RimWorld, Oxygen Not Included, and Mindustry. We matched them by the tags players give Creeper World 3: Arc Eternal on Steam (Tower Defense, Strategy, Indie, RTS, and Singleplayer): closest matches first, and among equally close ones the better-known games.

They Are Billions
Shared: Strategy · Tower Defense · RTS

FTL: Faster Than Light
Shared: Strategy · Indie · Sci-fi

RimWorld
Shared: Strategy · Base Building · Singleplayer

Oxygen Not Included
Shared: Singleplayer · Base Building · Strategy

Mindustry
Shared: Tower Defense · Strategy · RTS

Infested Planet
Shared: Tower Defense · Strategy · RTS

Particle Fleet: Emergence
Shared: Strategy · Indie · RTS

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

Defense Grid: The Awakening
Shared: Tower Defense · Strategy · Indie

Rise to Ruins
Shared: Tower Defense · Strategy · Indie

Door Kickers
Shared: Strategy · Indie · Singleplayer

Bloons TD 6
Shared: Tower Defense · Strategy · Singleplayer

Rusted Warfare - RTS
Shared: Strategy · RTS · Indie

Taur
Shared: Tower Defense · Strategy · Indie

Supreme Commander: Forged Alliance
Shared: Strategy · RTS · Sci-fi

Plague Inc: Evolved
Shared: Strategy · Indie · Singleplayer

Creeper World: Anniversary Edition
Shared: Strategy · Indie · Tower Defense

Starship Troopers: Terran Command
Shared: Strategy · RTS · Singleplayer

Game Dev Tycoon
Shared: Indie · Strategy · Simulation

Halo Wars: Definitive Edition
Shared: Strategy · RTS · Singleplayer

This War of Mine
Shared: Strategy · Singleplayer · Simulation

Kingdom Two Crowns
Shared: Tower Defense · Strategy · Singleplayer

Warhammer 40,000: Dawn of War - Definitive Edition
Shared: Strategy · RTS · Singleplayer

Age of Mythology: Retold
Shared: Strategy · RTS · Base Building