anchor.diff:      aliens = game.add.group();
       aliens.enableBody = true;
   
  -    for (var i = 0; i < 1000; i++) {
  +    for (var i = 0; i < 200; i++) {
         Sprite s = aliens.create(game.world.randomX, game.world.randomY, 'baddie');
         s.scale.set(1);
         s.body.collideWorldBounds = true;
  
positive.code: 
    create() {
  
      game.world.setBounds(0, 0, 250, 250);
  
      game.physics.startSystem(Physics.ARCADE);
  
  
negative.code: 
      cursors = game.input.keyboard.createCursorKeys();
  
      //game.camera.follow(ship);
    }
  
    update() {
  