Update app.py

app.py

@@ -42,11 +42,13 @@ var score = 0;
 var gameOver = false;
 var scoreText;
 
-var game = new Phaser.Game(config);
+const game = new Phaser.Game(config);
+
+document.getElementById('demo').appendChild = game
 function addNewElement() {
          // creating new element
          const newElement = document.createElement('div')
-         newElement.innerHTML = game
+         //newElement.innerHTML = game
          // adding a new element at the end of the body
          document.body.appendChild(newElement)
       }