Games like Crystal Guardian
Games like Crystal Guardian include Bloons TD 6, They Are Billions, Dungeon Defenders, Oxygen Not Included, and Frostpunk. We matched them by the tags players give Crystal Guardian on Steam (Strategy, Tower Defense, Time Management, 3D, and Survival): closest matches first, and among equally close ones the better-known games.

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

They Are Billions
Shared: Strategy · Tower Defense · Survival

Dungeon Defenders
Shared: Tower Defense · Strategy · Survival

Oxygen Not Included
Shared: Survival · Building · Strategy

Frostpunk
Shared: Strategy · Survival · Resource Management

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

Castle Story
Shared: Strategy · Building · Survival

Kingdom Two Crowns
Shared: Tower Defense · Strategy · Building

Emberward
Shared: Tower Defense · Strategy · 3D

Banished
Shared: Strategy · Survival · Indie

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

Bee Island
Shared: Strategy · Tower Defense · Building

Thronefall
Shared: Strategy · Tower Defense · 3D

Tower Dominion
Shared: Strategy · Tower Defense · Tactical

Artisan TD
Shared: Strategy · Tower Defense · Building

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

Age of Darkness: Final Stand
Shared: Tower Defense · Strategy · 3D

Rise to Ruins
Shared: Tower Defense · Strategy · Survival

Tavern Master
Shared: Strategy · Building · Resource Management

Mindustry
Shared: Tower Defense · Strategy · Building

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

This War of Mine
Shared: Strategy · Survival · Singleplayer

Rogue Tower
Shared: Strategy · Tower Defense · 3D

Ostriv
Shared: Strategy · Building · Survival