HTML5保卫星球射击小游戏基于HTML5 canvas制作，星球防御游戏，太空战机为阻止星球遭遇小行星撞击，进行击毁小行星的游戏，鼠标左键点击发射子弹。(HTML5 defend planet shooting game, based on HTML5 canvas production, star defense game, space fighters to prevent the asteroid encounter asteroid collision, asteroid destruction game, the left mouse button fired bullets.)