I'm not going to say too much for risk of spoiling a great thing; however, you should know that there are a number of secrets and nods to the film to be uncovered. It's also probably best to avoid the "About" section up till the point you're done to avoid more spoilers.
So, what's the magic word?
P.S. If you're as computer-savvy as Robinson and feel the need to contribute to the project, the creator's taking pull requests over on github.
Photo by Kurtis Garbutt/Flickr (CC BY 2.0)