assignment3 (shangyu xie)

This is the first time I have tried to make a shooting game. I tried to imitate the professors style. The player can fly the spacecraft, and there are three lives. The enemys spacecraft is randomly generated. If the player encounters the enemy, he will lose his life. When his life is exhausted, the player will die. But in this project, I havent added the beginning and end scenes. I will join in the next mission.