I'm trying to get the hang of Phaser right now, and this is what I managed to put up so far after a few hours:

Pretty unimpressive stuff so far, but that's because I had trouble with a certain line:

this.game = new Phaser.Game(640, 480, Phaser.AUTO, '');

After looking at tutorials of Phaser on YouTube, I fixed up the code a bit by adding the functions to the line:

{ preload: this.preload, create: this.create }

And it worked!

Now I just maybe need to get some images, maybe a tilemap, working...