How to use
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1. When the main screen appears, press the Start button.
2. When the bus line comes out, touch the bus line with your finger to adjust it.
3. Kill an enemy ship, but if you hit it, it dies.
4. There are two kinds of gifts (machine gun upgrades, missiles)
5. The machine gun is upgraded to Auto.
6. Missiles accumulate, and you can double-click to destroy enemies on the screen.
7. You can check the score you have accumulated by dying when you hit a ship and an enemy ship.
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