There is really no timeline on completion other than one of the devs mentioning that they are going to start making Sui Generis as soon as they finish up developing the essential gameplay features in Examina. I don't want to sound like I am impatient or pushy but we are actually waiting on an update that actually regards interaction with non-playable characters which is essential on it's own and it's exciting because there is no NPC you can encounter in the story mode, then a new level, that will actually be placed inbetween the ones that are already released but not completed. Even for that we don't have a due date, might bother some people here but I personally don't mind since I bought Examina like you did. I hope this briefly covers it up if not someone may come with a better reply and actually correct me if i'm wrong on any of this
edit: ALSO welcome!!