SPIRE: Idle Tower Defense TD

SPIRE is idle tower defense at its purest: one tower in the center, endless waves closing in from all 360 degrees. The tower fires on its own — your job is to upgrade it faster than the pressure grows and push one wave further every run.

⚔️ THE RUN
Enemies drop cash. Spend it mid-battle across three upgrade branches — Attack, Defense, Utility — and watch your tower turn into a fortress. Bosses every 10 waves, elites that hit harder, and no pause: every second you don't upgrade, the wave gets closer.

🔁 DIE, BANK, COME BACK STRONGER
Every run ends. That's the point. Bank your coins, buy permanent upgrades, and dive back in — the roguelike loop of idle TD where your tower is always a little stronger than last time.

🔧 META PROGRESSION
- Workshop — permanent tower upgrades bought with Coins
- Cards — collect copies, raise star tiers, stack effects
- Lab — research that keeps running while you're offline
- Ultimates — Nova, Vortex, Stasis, Arc and more, unlocked with Cores
- Tiers — higher difficulties, bigger rewards

💤 TRUE IDLE
- Offline income — currency piles up while you're away
- Lab research continues without the app open
- x3 speed when you don't feel like waiting
- Daily missions and milestones
- Progress saved automatically — one minute or one hour, it all counts

✨ FAIR TO PLAYERS
- No in-app purchases, no premium currency to buy
- Everything is earned through play
- Save stored locally, no data collection, no account

📱 WORKS EVERYWHERE
Fully offline. No signal needed — on a plane, on the metro, in a queue.

If you like idle tower defense, incremental games and endless wave survival where numbers keep going up, SPIRE gives you the loop with none of the noise.

Download SPIRE and see how many waves your tower can hold.

Recent changes:
• Every upgrade now explains what it does (tap it in battle)
• Stronger per-level upgrades — every level counts
• Lab reworked: research multiplies damage, HP, cash and coins
• Ultimates: see details before you unlock
• Perks rebalanced — less luck, more skill
• Warp start: skip early waves once your best is 20+