Unity? Well, if someone would make an UnUnity that would do what UnRen does for Ren'Py, I would be ecstatic over that engine. Personally, the first thing I do after downloading, is check out the images to see what's been changed. Then I enable the Developer Menu so I can view the Variables while I play. Maybe do a force rollback or skip, depending.
But, that's just me.
If Dr.Sin fixes the UI problems with saves, rollbacks, etc., and delivers the walkthroughs like he did with Dreams of Desire, I will be more than happy to play this game. As many have already noted, the girls are outstanding, and the animations are first rate! [Remember those crude animations that accompanied the early releases of DOD? ECCH!]
So, I like the way the plot is unfolding, and look forward with great interest to the next release.