I was actually inspired not too long ago by this game, and a few others, to start learning Twine and a bit of HTML/CSS/etc. to make a game somewhat like IB. Like's already been said stealing wouldn't be very cool and no one would want to take over if a game's creator hasn't definitively abandoned it, but I think inspiration/homage is fine. I've got the skeleton of a game done. Not ready to be released at all but it'll come.
The big thing I'd say is that you really don't need much experience to get going with Twine at all, and there are a bunch of helpful posts and youtube videos out there about how to get into it. So if anyone else feels the urge and has the spark of an idea, go for it.