Games like Galaxy Defense War
Games like Galaxy Defense War include Kingdom Rush 5: Alliance TD, Plants vs. Zombies GOTY Edition, Kingdom Rush Frontiers - Tower Defense, Bloons TD 6, and Kingdom Rush - Tower Defense. We matched them by the tags players give Galaxy Defense War on Steam (Strategy, Roguelite, Tower Defense, 2D, and Base Building): closest matches first, and among equally close ones the better-known games.

Kingdom Rush 5: Alliance TD
Shared: Strategy · Tower Defense · 2D

Plants vs. Zombies GOTY Edition
Shared: Strategy · Tower Defense · 2D

Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · Tower Defense · 2D

Bloons TD 6
Shared: Strategy · Tower Defense · Singleplayer

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · 2D

Kingdom Rush Origins - Tower Defense
Shared: Strategy · Tower Defense · 2D

Oxygen Not Included
Shared: Base Building · Building · 2D

Cult of the Lamb
Shared: Base Building · Roguelite · Singleplayer

Kingdom Two Crowns
Shared: Tower Defense · Strategy · Base Building

Mindustry
Shared: Tower Defense · Base Building · Strategy

Rogue Tower
Shared: Strategy · Tower Defense · Roguelite

Emberward
Shared: Strategy · Tower Defense · Roguelite

They Are Billions
Shared: Strategy · Base Building · Tower Defense

Tower Dominion
Shared: Strategy · Tower Defense · Base Building

Kingdom Rush Vengeance - Tower Defense
Shared: Strategy · Tower Defense · 2D

Prison Architect
Shared: Strategy · Building · Base Building

Kingdom: New Lands
Shared: Tower Defense · Base Building · Roguelite

Factorio
Shared: Base Building · Strategy · Building

Drill Core
Shared: Strategy · Roguelite · Tower Defense

Vampire Survivors
Shared: Roguelite · 2D · Singleplayer

Forts
Shared: Strategy · Base Building · Building

RimWorld
Shared: Strategy · Base Building · Singleplayer

Wall World
Shared: Roguelite · Tower Defense · Strategy

Balatro
Shared: Strategy · Roguelite · Singleplayer