What about the final release? When he will finish the game i think other people could add content to the game; this happened already in the past with the game "Big Brother" for example where people even made modded or reworked versions of the game (or sequel, i don't remember exactly).
That depends a lot, those people should have to make content to it for free or otherwise Icstor could just claim his copyrights, and I doubt that people in the long run would actually be willing to do it for free after seeing the time that they have to invest and bother to rendering, scripting and coding to just make kind of "B-class" version of it. Making a whole new game - kind of original one - with pretty similar looking and totally different named characters could be a possibility so it could be funded through Patreon etc., but it would mean starting the whole thing from a scratch.
Long story short, unless Icstor gives up his copyrights for the game (which won't happen because $$$) or there would be people willing to work that fanmade "remake" of it for free, then we will just have to disappoint with what Icstor gives us in his final release.
I'll be happy as long as i get my Celia pregnancy ending.
I bet no-one is getting pregnant there. It would be already a success if Sara would get rid of her virginity, but even that is doubtful.