function Tower:upgrade() self.level = self.level + 1 self.damage = self.damage * 1.2 self.range = self.range * 1.2 end
-- Game logic local game = {} game.enemies = {} game.towers = {} game.wave = 1
-- Tower settings towerDamage = 10, towerRange = 100, towerUpgradeCost = 100,
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