I have played this game and enjoyed it to the fullest for a while now, feeling that this had a different setup than most of the incest-centered games. It could very well be a classical love story, yet it adds many layers to the characters' doubts and inner struggles, about the moral implications that their actions may hold and the damage it would do to their bonds.
It is one of the few games that I spent time on reading every line and appreciating the work, and even if there are some flaws of course (and some inconsistencies in the pacing, which may be intentional or not). Not every story is perfect, but that makes it even more realistic.
So, keep up the good work, mate !
I have only started the 2.6 update, but I will take my time to savor it !
P.S : Did you blend both versions of Promise (the original and the reprise) in that sweet music during the confession-kiss / reminiscence scene ?
If I heard correctly, then you have all my respect.