Crystal Keeper

Crystal Keeper is a survival defense game in which you mine crystals and protect your wall from endless waves of enemies. You balance gathering resources with defending your base, upgrading your defenses, improving mining efficiency and unlocking abilities as you try to survive for as long as possible.

Choose your upgrades

Every few waves, choose one of three random permanent upgrades. With 6+ upgrade paths, you can develop a warrior who barely needs walls, build up a mining operation with impenetrable automated defenses, or take another approach to survival.

Build and defend

You can build turrets, auto-drills and other defensive structures. The game combines idle progression with active play, and the waves grow more difficult over time. Late-game content takes 1–2 hours to reach.