[fix bug] Stage.addChild(this,'units'); -> Stage.addChild(this,'towers');
[fix bug] Stage.addChild(this,'units'); -> Stage.addChild(this,'towers');

vicksonzero/TyphoonTycoon,jasonycw/TyphoonTycoon,vicksonzero/TyphoonTycoon,ericksli/TyphoonTycoon,ericksli/TyphoonTycoon,jasonycw/TyphoonTycoon