Here on itch dont look at the tag but on the version instead, its unwritten term that programmers name their pre-releases with a leading zero, like 0.8.2. Thats way more reliable and applies to all plattforms and all software. That means, 1.0 would be a finished story (unless they add DLCs or more details and then call it e.g. 1.1).
But: Games from indie developers - and escpecially here on itch - rarely reach the state of 1.0, or to be specific: Developers don't like to set static ETAs or closed plots, instead a lot of them just vanish one day, the only indicator then is the lack of activity from them here for a long time.
Whether it's worth trying in general? Depends on. This game? Absolutely, it's one of the best I would say! In my opinion you'll find no other free hentai game in RenPy here which 3D anime content being that outstanding good (besides of Eternum maybe) without exaggerated proportions. Plus, I think the story awesome .