It's one of the largest, content wise, and oldest adult games listed on F95 with one of the biggest fan bases of adult games, in general. However, it is undergoing a tech update which means that save progress in the current version may not be compatible with a future release although past releases have usually been compatible (discounting user error). As for "percent finished" - while there are three main goals (investigating father's death, dating mechanics to select a date for the big dance, earn a lot of $$$) with one finished (father) and one easily solvable ($$$), the dance date still remains incomplete. That said, there are still several NPC storylines in the pipeline for development, additional scenes to be created, etc. The idea that this will ever be truly finished is a folly of an idea - as long as the developer likes what he's doing and there is a fanbase to do it, he has stated he has a lot of concepts to continue developing this well into the future.
Because you're new to F95 - I would recommend using the F95 search function for further questions you might have in this thread or for other game threads. More likely than not, they've been answered multiple times - even recently.