实现了一个简单的小游戏Flappy Bird
主要的构件有天空盒，地板，障碍物，还有一只可以动的小鸟
碰撞和通关会有提示
不足之处在于不能自由的挪动视角。
游戏特色：得分提示、视角会随你的得分变大，同时鸟的速度加快
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