That tool looks really cool! We hadn't come across that one before, but we did look into a lot of embedding solutions back when we were making these kinds of presentations regularly.
I think with Thorntale we're actually trying to take a slightly different route to a solution; being the actual presentation tool is going to unlock a lot of interactivity features that exporting to powerpoint probably can't ever do. Hopefully we'll be able to show some of those off after a few more months of dev!