That version online is a pretty outdated now, but hopefully it will help get you started. The version I'm using now has a lot of extra stuff, such as being able to call animations from within text dialogue, supporting multiple paths so that lines aren't going all over the place (this is pretty essential imo), and supporting more conditional options.
Unfortunately, the new version is tied pretty closely to my own project. I went to pull it apart to update the tutorial, but it was a bit of a pita, and I wasn't sure how beneficial it would be to anyone as I figured that once you get started with this sort of thing, it kind of makes sense anyway, so I didn't bother.
If you want to discuss it further, feel free to hit me up over Discord. One day I'll get round to updating the tutorial...