There is really no benefit to the Dev to revisit a game that has been complete for years. Unless it was to remaster and get a Steam release, but that would pretty much require remaking the game. Better to focus on their current game.
I came just to mention a remaster.
This may be my favorite Adult VN of all-time but it could use some basic fixes.
If I were the dev (or maybe just a fan with time on their hands), I would at the very least run the images through some AI to make the characters pop a bit more. Use a set model or seed for each character and automate a quick image improvement.
If you had more time and wanted to profit for a Steam release go ahead and redo it all in Daz.
I think the story is mostly fine but I'd add a few more options while also cleaning up some of the bad UI, pace near the middle/near ending and bugs. The end was kind of rushed on each path, IMO.
But that's all I'd change. Again, maybe my single favorite VN ever to this day.