Author here. I started this when the original comic was released in 2012 but it fell by the wayside. Recently I decided to pick up where I left off. It was interesting to take my own legacy coffeescript code from a time in which I didn't really know what I was doing and try to make it into something fun.
Code is here:
https://github.com/natejenkins/xkcd-mario
Thanks for any feedback!