Hi! I discovered this game through your making-of post, which links to a couple of my Twine tutorials. I haven't actually played it yet (though it looks very impressive!) - I just wanted to let you know that the HTML file you've uploaded here is the "raw game data" you mention not having backed up in your post. It can be imported into Twine 2 without the need for any kind of converter. You may find it throws out some kind of error initially (I think due to a recent update to Twine itself) but if you return to the story list it should be right there.
Hopefully this saves you some further Googling if you do ever want to open it up again and make a few changes!