操作指南：鼠标左键射击、动，空格键可暂停，下方出现红色箭头时可选择子弹或加固星球等。
Operate guidebook: Mouse the left key shoot, move, the blank space key can pause, can choose bullet or reinforce star etc. while appearing red arrowhead under.
操作指南：鼠标控制，左键点击吸血蝙蝠射击。
Operations guide: mouse control point and click shooting the vampire bat.
鼠标控制方向，可以上下左右移动，点击鼠标左键标准飞碟射击。
Mouse control direction, from top to bottom and move around, click the left mouse button standard flying saucer shooting.
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