JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/phaser/2.6.1/phaser.min.js"></script>

JavaScript

var P= P || {}

P.draw = function(game,posx,posy){

this.character=game.add.sprite(posx,posy,'circle')
this.fall=function(){
this.character.y+=1
}
return this
}

P= P || {}


var game = new Phaser.Game(800, 600, Phaser.CANVAS, 'phaser-example', { preload: preload,create: create, update: update, render: render });

var player
var opponent

function preload() {
   game.load.image('circle', 'https://s13.postimg.org/xjhlzmiev/disc_png.png');
}

function create() { 
player=new P.draw(game,100,100)
opponent=new P.draw(game,200,200)
}

function update() {
player.fall()
opponent.fall()
}

function render() {
}