It costs stars to upgrade your ship. Obtain stars by playing the levels and collecting them from the enemies you destroy. The stats that can be upgraded on your ship are Health, Main Cannon, Wing Cannons, Magnet, Missiles, Laser, Energy Shield, and Mega Bomb.
• Gift Shop: Every three hours you can watch an ad to pick from three cargo crates. The chosen one gives you a certain number of stars to spend on upgrades.
• Precious Cargo: Gives you 5,000 stars instantly.
• SX2-Star Doubler: Doubles the number of stars earned.
• Ads Removal: Removes all ads from the game forever.
• Planes Generator: Dramatically speeds up plane production.
