Plane War

~How to play:
1. Use joystick to move
2. Use the firing button below to fire the bullet

~What are we going to do:
1. Use bullets to destroy enemy ships
2. Points will be awarded after defeating the enemy
3. You can use points to upgrade your ship
4. After upgrading all the upgrades of this level, you need to upgrade the spacecraft
5. Bullets can only be obtained when defeating an enemy ship or purchased
6. You can purchase bullets with points when you upgrade to Level 5 "Buy Bullets"