Gravity Defense is an idle tower defense game with real gravity wells.
Pull asteroids into kill zones, defend your planets, and earn Alpha Coins that persist between runs. Scrap is spent during a mission. Alpha Coins and Diamonds upgrade your fleet forever.
WHAT YOU DO
• Gravity control: strengthen or weaken each planet’s pull. Bend incoming rocks instead of watching them walk down a lane.
• Five planet types: Kinetic lasers, Fire and Poison auras, Water frost, and Void nodes. Mix roles. Relocate planets mid-fight.
• Orbital bridges: link planets so they fight as one rotating formation.
• Drones and black holes: late-game tools that patrol, shield, harvest, and swallow swarms.
• Idle rewards: the Orbital Relay keeps earning while you’re away.
PROGRESSION
• In-run Scrap for instant power.
• Alpha Coins for permanent damage, health, speed, and yield.
• Diamonds for rare tech.
• Optional 2× rewarded ad on defeat.
• Daily challenges and higher-difficulty sectors after deep runs.
WHY IT’S DIFFERENT
Most tower defense games use fixed paths. Gravity Defense uses orbital physics. Fast debris slingshots. Tanks slam. Shooters hang back and fire. Your job is to place planets, tune gravity, and spend upgrades before the swarm hits core.
Can you hold the line against the infinite swarm?
Idle tower defense with real gravity. Bend asteroids. Upgrade planets. Survive.