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Mine crystals and defend your wall in this survival defense game. Balance resource gathering with combat as you upgrade your way through endless enemy waves.
Price history tracked since Jul 7, 2026 · vs all tracked offers.
Based solely on tracked price history — not purchase advice.
Tracked since Jul 7, 2026.
Steam Train Fest ends
A tiny survival defense game about mining crystals and defending your wall.
Your base is under siege! As the keeper, you mine crystals while fighting off endless waves of enemies. You'll upgrade your defenses, boost your mining efficiency, and unlock powerful abilities as you see how long you can survive.
Every few waves, pick from three random permanent upgrades that shape your strategy. Will you become an unstoppable warrior who barely needs walls? A mining tycoon with impenetrable automated defenses? Or find your own path to survival?
Can you find the perfect balance between gathering resources and defending your walls?
Features
⚔️ Dual gameplay - mine crystals while defending your castle
💎 6+ different upgrade paths to develop
🏰 Turrets, auto-drills, and defensive structures to build
📈 Idle progression with active gameplay elements
🌊 Endless waves with increasing difficulty
🎯 Permanent upgrade choices every few waves
⏰ 1-2 hours to reach late game content
Lowest tracked price: €1.49 (Jul 7, 2026) · current best: €2.99.
29% positive reviews all-time.
Right now the cheapest offer for Crystal Keeper is €2.99 at Steam. KingsPrice compares 1 offers from 1 stores — official stores and keyshops — and refreshes prices throughout the day.
The lowest price KingsPrice has tracked for Crystal Keeper is €1.49 (recorded on Jul 7, 2026). This covers the stores and period we monitor — set a price alert to catch the next drop to that level.
Create a free price alert on this page and KingsPrice will email you when Crystal Keeper drops below your chosen price. The biggest discounts usually appear during seasonal Steam sales and publisher promotions — the sale calendar on this page shows the next confirmed event.
