Games like Polygon War
Games like Polygon War include FTL: Faster Than Light, Plants vs. Zombies GOTY Edition, Bloons TD 6, Dome Keeper, and Balatro. We matched them by the tags players give Polygon War on Steam (Singleplayer, Strategy, Roguelike, Auto Battler, and Tower Defense): closest matches first, and among equally close ones the better-known games.

FTL: Faster Than Light
Shared: Roguelike · Strategy · Singleplayer

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

Bloons TD 6
Shared: Strategy · Singleplayer · Tower Defense

Dome Keeper
Shared: Singleplayer · Roguelike · Tower Defense

Balatro
Shared: Roguelike · Singleplayer · Strategy

Defense Grid: The Awakening
Shared: Strategy · Singleplayer · Tower Defense

Nubby's Number Factory
Shared: Strategy · Roguelike · Singleplayer

Kingdom Rush - Tower Defense
Shared: Strategy · Singleplayer · Tower Defense

Dungeon of the ENDLESS™
Shared: Strategy · Roguelike · Tower Defense

Kingdom Rush 5: Alliance TD
Shared: Strategy · Singleplayer · Tower Defense

9 Kings
Shared: Strategy · Roguelike · Auto Battler

Legend Creatures(传奇生物)
Shared: Roguelike · Strategy · Auto Battler

Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · Singleplayer · Tower Defense

Creeper World 3: Arc Eternal
Shared: Strategy · Singleplayer · Tower Defense

Slay the Spire
Shared: Roguelike · Strategy · Singleplayer

Slay the Spire 2
Shared: Roguelike · Strategy · Indie

The Binding of Isaac: Rebirth
Shared: Roguelike · Singleplayer · Indie

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

Zero Stress King: Idle Defense
Shared: Strategy · Tower Defense · Auto Battler

Kingdom Rush Origins - Tower Defense
Shared: Strategy · Singleplayer · Tower Defense

Backpack Battles
Shared: Strategy · Auto Battler · Roguelike

Kingdom Rush Vengeance - Tower Defense
Shared: Strategy · Singleplayer · Tower Defense

Brotato
Shared: Singleplayer · Roguelike · Sci-fi

Wall World
Shared: Roguelike · Strategy · Tower Defense