If you downloaded, double click index.html, on the website is pretty straightforward.
It was firstly made directed to portals that shared flash games with some PHP among them. I adapted later to export the download file.
Prevent users to go back was intentionally build, the natural behaviour would be navigate through web pages, but that would spoil the system of choices and consequences. That is a style of game, there is no right path, the game have dozens of outcomes, good and bads. Several save slots were added to allow users to go back to any point.