Games like Tau Cubis
Games like Tau Cubis include Thronefall, Stellaris, Bloons TD 6, DG2: Defense Grid 2, and Defense Grid: The Awakening. We matched them by the tags players give Tau Cubis on Steam (Strategy, Tower Defense, Minimalist, Colorful, and Sci-fi): closest matches first, and among equally close ones the better-known games.

Thronefall
Shared: Strategy · Tower Defense · Minimalist

Stellaris
Shared: Strategy · Space · Sci-fi

Bloons TD 6
Shared: Strategy · Tower Defense · 3D

DG2: Defense Grid 2
Shared: Strategy · Tower Defense · Sci-fi

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

Rogue Tower
Shared: Strategy · Tower Defense · Minimalist

Outpost: Infinity Siege
Shared: Tower Defense · 3D · Robots

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

Taur
Shared: Strategy · Tower Defense · Sci-fi

Kingdom Two Crowns
Shared: Tower Defense · Minimalist · Strategy

SENTRY
Shared: Tower Defense · Strategy · Sci-fi

Creeper World 4
Shared: Tower Defense · Strategy · Space

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

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

Bee Island
Shared: Strategy · Tower Defense · Minimalist

Sid Meier's Civilization®: Beyond Earth™
Shared: Strategy · Sci-fi · Space

Planetary Annihilation: TITANS
Shared: Strategy · Sci-fi · Real Time Tactics

Aliens: Dark Descent
Shared: Strategy · Sci-fi · Real Time Tactics

Battlefleet Gothic: Armada (Classic)
Shared: Strategy · Space · Sci-fi

Homeworld 3
Shared: Strategy · Space · Sci-fi

Age of Darkness: Final Stand
Shared: Tower Defense · Strategy · 3D

Sins of a Solar Empire II
Shared: Strategy · Space · Sci-fi

Bad North: Jotunn Edition
Shared: Tower Defense · Minimalist · Real Time Tactics

Creeper World 3: Arc Eternal
Shared: Strategy · Tower Defense · Sci-fi

