Games like Idle Geometry Defense
Games like Idle Geometry Defense include Dyson Sphere Program, Nodebuster, Incredicer, Sixty Four, and Mindustry. We matched them by the tags players give Idle Geometry Defense on Steam (Incremental, Tower Defense, Strategy, Space Sim, and Automation): closest matches first, and among equally close ones the better-known games.

Dyson Sphere Program
Shared: Automation · Sci-fi · Strategy

Nodebuster
Shared: Incremental · Strategy · Idler

Incredicer
Shared: Incremental · Strategy · Idler

Sixty Four
Shared: Incremental · Strategy · Automation

Mindustry
Shared: Tower Defense · Automation · Strategy

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

Bills Must Be Paid
Shared: Incremental · Strategy · Idler

Factorio
Shared: Automation · Strategy · Survival

Cookie Clicker
Shared: Incremental · Idler · Indie

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

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

Tower Wizard
Shared: Incremental · Strategy · Idler

Cosmoteer: Starship Architect & Commander
Shared: Sci-fi · Strategy · Space Sim

Shelldiver
Shared: Incremental · Idler · Strategy

shapez 2 - Factory
Shared: Automation · Strategy · Futuristic

Cliff Empire
Shared: Strategy · Sci-fi · Futuristic

Sanctum 2
Shared: Tower Defense · Strategy · Sci-fi

Rise to Ruins
Shared: Tower Defense · Strategy · Survival

Starvester
Shared: Incremental · Strategy · Automation

Dungeon of the ENDLESS™
Shared: Tower Defense · Strategy · Sci-fi

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

A Game About Feeding A Black Hole
Shared: Incremental · Strategy · Idler

Scritchy Scratchy
Shared: Incremental · Idler · Arcade

Stellaris
Shared: Strategy · Sci-fi · Simulation