如何用CocosCreator实现射击小游戏

cc.Class({
    extends: cc.Component,

    properties: {
        playerNode: cc.Node,
        enemyNode: cc.Node,
        fireNode: cc.Node,
        scoreNode: cc.Label,
    },
    
     onLoad () {
        this.playLoad();
        this.fireLoad();
        this.enemyLoad();
         this.node.on("touchstart",this.fire,this);
         
     },

     update (dt) {
          if(Math.abs(this.fireNode.y-this.enemyNode.y)<(this.fireNode.height/3+this.enemyNode.height/3)
            &&Math.abs(this.fireNode.x-this.enemyNode.x)<(this.fireNode.width/3+this.enemyNode.width/3)){
              console.log("击败敌机");
              this.scoreNode.string= ++this.score;//击中得分
            this.fireNode.stopAction(this.fireAction);
            this.enemyNode.stopAction(this.enemyAction);
            this.enemyNode.active=false;
            this.fireNode.active=false;
            this.fireLoad();//初始化子弹
            this.enemyLoad();// 初始化敌机
          }

     },

     // 关闭事件监听
     onDestroy(){
        this.node.off("touchstart",this.fire,this);
     },
    // 初始玩家
    playLoad(){
        this.score=0;
        this.playerNode.y=-cc.winSize.height/4;
        
    },
    //初始化子弹
    fireLoad(){
        this.fireNode.active=true;
        this.isFire=false;
        this.fireNode.x=this.playerNode.x;
        this.fireNode.y=this.playerNode.y+this.playerNode.height;
    },
    // 初始化敌机
    enemyLoad(){
        this.enemyNode.active=true;
        this.enemyNode.x=Math.random()* cc.winSize.width;
        this.enemyNode.y=cc.winSize.height/3;
        let x=cc.winSize.width/2-this.enemyNode.width/2;
        let y=Math.random()* cc.winSize.height/4;
        let seq=cc.repeatForever(cc.sequence(cc.moveTo(1.5,cc.v2(-x,y)),cc.moveTo(1.5,cc.v2(x,y))));
        
        this.enemyAction=this.enemyNode.runAction(seq);
    },
    // 死亡 重新加载游戏
    dear(){
        console.log("死亡");
        cc.director.loadScene("game_scenes");
    },


    // 发射子弹
     fire(){
         if(this.isFire) return;
         this.isFire=true;
        console.log("开始发射");
         var fireaction=cc.sequence(
             cc.moveTo(1,cc.v2(this.playerNode.x,cc.winSize.height/2)),
             cc.callFunc(()=>{
                this.dear();
            }));
        this.fireAction=this.fireNode.runAction(fireaction);
        console.log("结束发射");
     }

});