Games like Nightside
Games like Nightside include Creeper World 3: Arc Eternal, FTL: Faster Than Light, STAR WARS™ Empire at War - Gold Pack, Natural Selection 2, and Warhammer 40,000: Dawn of War III. We matched them by the tags players give Nightside on Steam (Strategy, Indie, RTS, and Sci-fi): closest matches first, and among equally close ones the better-known games.

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

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

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

Natural Selection 2
Shared: Strategy · Sci-fi · RTS

Warhammer 40,000: Dawn of War III
Shared: Strategy · RTS · Sci-fi

Original War
Shared: Strategy · RTS · Sci-fi

Planetary Annihilation: TITANS
Shared: Strategy · RTS · Sci-fi

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

Infested Planet
Shared: Strategy · RTS · Indie

Iron Marines
Shared: Strategy · RTS · Sci-fi

Warhammer 40,000: Dawn of War II - Anniversary Edition (Classic)
Shared: Strategy · RTS · Sci-fi

Defense Grid: The Awakening
Shared: Strategy · Sci-fi · Indie

Warhammer 40,000: Dawn of War - Anniversary Edition (Classic)
Shared: Strategy · RTS · Sci-fi

Aliens: Dark Descent
Shared: Strategy · RTS · Sci-fi

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

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

Particle Fleet: Emergence
Shared: Strategy · Indie · RTS

Halo Wars: Definitive Edition
Shared: Strategy · RTS · Sci-fi

StarDrive
Shared: Strategy · Indie · Sci-fi

Homeworld: Deserts of Kharak
Shared: Strategy · RTS · Sci-fi

Grey Goo
Shared: Strategy · RTS · Sci-fi

Battlefleet Gothic: Armada 2
Shared: Strategy · RTS · Sci-fi

Starship Troopers: Terran Command
Shared: Strategy · RTS · Sci-fi

Supreme Commander 2
Shared: Strategy · RTS · Sci-fi