Games like PieceMonsters
Games like PieceMonsters include Bloons TD 6, Plants vs. Zombies GOTY Edition, Yaoling: Mythical Journey, Backpack Battles, and Legion TD 2 - Multiplayer Tower Defense. We matched them by the tags players give PieceMonsters on Steam (Strategy, Creature Collector, Tower Defense, Auto Battler, and Puzzle): closest matches first, and among equally close ones the better-known games.

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

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

Yaoling: Mythical Journey
Shared: Strategy · Creature Collector · Cute

Backpack Battles
Shared: Strategy · Auto Battler · Inventory Management

Legion TD 2 - Multiplayer Tower Defense
Shared: Tower Defense · Strategy · Auto Battler

Thronefall
Shared: Strategy · Tower Defense · 3D

Creature Kitchen
Shared: Creature Collector · Puzzle · Cute

Warpips
Shared: Strategy · Tower Defense · Auto Battler

Artisan TD
Shared: Strategy · Tower Defense · Puzzle

Buckshot Roulette
Shared: Strategy · 3D · Indie

GemCraft - Chasing Shadows
Shared: Strategy · Tower Defense · Indie

Emberward
Shared: Strategy · Tower Defense · 3D

Slime Rancher 2
Shared: Cute · Creature Collector · Singleplayer

Baba Is You
Shared: Puzzle · Indie · Cute

Dungeon Warfare
Shared: Strategy · Tower Defense · Indie

WEBFISHING
Shared: Creature Collector · Cute · Indie

The Last Campfire
Shared: Puzzle · Cute · Indie

Mini Metro
Shared: Strategy · Puzzle · Indie

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

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

Rogue Tower
Shared: Strategy · Tower Defense · 3D

ISLANDERS
Shared: Strategy · Puzzle · Indie

Orcs Must Die! 3
Shared: Strategy · Tower Defense · 3D

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