Polygon War New Shop Items

In this update, I added some items for sale in the store, not to increase turret stats, but rather improvements that change their behavior. Here's the list:

• Every tenth shot is a powered shot. (More damage, size and penetration).
• Lose 50% of life points, vampirism heals you double.
• Doubles damage, rotation speed and cadence, but lose 0.05% of life points for each shot.
• Every 5 shots heals 1 life point, but lose 50% damage and cadence.
• One extra coin for each critical hit. Lose double of your economy.
• Store healing is free, but you can't heal in any other way.
• Immunity to enemy projectiles.
• At the beginning of each round, if not generated, a special Orbital Bullet is created.
• Now bullets poison enemies. If the Chemical Turret is in play, the poison is doubled.