Games like Gemstone Guardians
Games like Gemstone Guardians include Bloons TD 6, Kingdom Two Crowns, Kingdom Rush 5: Alliance TD, Thronefall, and Plants vs. Zombies GOTY Edition. We matched them by the tags players give Gemstone Guardians on Steam (Strategy, Tower Defense, 3D, Building, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Bloons TD 6
Shared: Strategy · Tower Defense · Singleplayer

Kingdom Two Crowns
Shared: Tower Defense · Building · Strategy

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

Thronefall
Shared: Strategy · Tower Defense · Building

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

Emberward
Shared: Tower Defense · Strategy · 3D

Rogue Tower
Shared: Strategy · Tower Defense · 3D

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

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

Castle Story
Shared: Strategy · Building · Tower Defense

Dungeon Defenders
Shared: Tower Defense · Strategy · Singleplayer

Artisan TD
Shared: Strategy · Tower Defense · Building

Creeper World 4
Shared: Tower Defense · Building · Strategy

ISLANDERS
Shared: Strategy · Building · Indie

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

Bee Island
Shared: Strategy · Tower Defense · Building

Planet Coaster 2
Shared: Strategy · Building · 3D

They Are Billions
Shared: Strategy · Tower Defense · Building

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

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

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

Buckshot Roulette
Shared: Strategy · Singleplayer · 3D

Dungeon Warfare
Shared: Strategy · Tower Defense · Indie

Mindustry
Shared: Tower Defense · Strategy · Building