Checking the levels

GamePlay.js

@@ -3,6 +3,9 @@ class GamePlay extends Board {
         super(ctx, key);
 
         this.controls = {
+            'KeyS': ()=>{
+                this.nextLevel(++this.level);
+            },
             'KeyX': ()=>{ 
                             let b = new Ball();
                             b.update(this.ctx, this.bar.x + this.bar.w/2, this.bar.y);