I seem to be getting a crash when I try to Start Game.
If you go in the Content/Maps folder, rename the xml file to "Level01.xml". This let me play the game.
If you look at his GitHub he has a bunch more levels. You can download those and insert those into the map folder.
Yup, I forgot to add them to the ContentPipeline. I just rebuild it and updated all the files - it should hopefully work now.