Games like Defense Builder
Games like Defense Builder include Bloons TD 6, Starship Troopers: Terran Command, Creeper World 4, IDUN - Frontline Survival, and XCOM 2. We matched them by the tags players give Defense Builder on Steam (Strategy, Tower Defense, Sci-fi, War, and Wargame): closest matches first, and among equally close ones the better-known games.
Bloons TD 6
Shared: Strategy · Tower Defense · Singleplayer
Starship Troopers: Terran Command
Shared: Strategy · War · Sci-fi
Creeper World 4
Shared: Tower Defense · Wargame · Strategy
IDUN - Frontline Survival
Shared: Tower Defense · Strategy · 3D
XCOM 2
Shared: Strategy · Sci-fi · War
Broken Arrow
Shared: Strategy · Wargame · War
Creeper World 3: Arc Eternal
Shared: Strategy · Tower Defense · Sci-fi
Totally Accurate Battle Simulator
Shared: Strategy · War · Singleplayer
Plants vs. Zombies GOTY Edition
Shared: Tower Defense · Strategy · Singleplayer
STAR WARS™ Empire at War - Gold Pack
Shared: Strategy · Sci-fi · War
Warpips
Shared: Strategy · Tower Defense · War
Defense Grid: The Awakening
Shared: Strategy · Tower Defense · Sci-fi
Infested Planet
Shared: Strategy · Tower Defense · Sci-fi
Outpost: Infinity Siege
Shared: Tower Defense · 3D · Sci-fi
Aliens: Dark Descent
Shared: Strategy · Sci-fi · Top-Down
FTL: Faster Than Light
Shared: Strategy · Sci-fi · Singleplayer
Warhammer 40,000: Battlesector
Shared: Strategy · 3D · Sci-fi
Minimalist Tower Defense
Shared: Strategy · Tower Defense · Top-Down
Thronefall
Shared: Strategy · Tower Defense · 3D
DG2: Defense Grid 2
Shared: Strategy · Tower Defense · Sci-fi
Bad North: Jotunn Edition
Shared: Tower Defense · Wargame · War
Tempest Rising
Shared: Strategy · 3D · War
Company of Heroes 3
Shared: Strategy · Wargame · Singleplayer
Sanctum 2
Shared: Tower Defense · Strategy · Sci-fi