Appears like the linking to the Phaser library doesn't work. I was able to make it work by downloading the Phaser library manually and changing the link on the HTML file. I think you should check that.
In the other hand, the game it's fine, I have no one to play it but works fine and stuff as far as I have seen.
It would also help a bit if the player sprites were a little bit bigger, maybe check if you can stretch the play field or something, scale it to 2x. Maybe Phaser has something for that. But overall very nice and good job on getting something delivered! :) Cheers.