I understand the need to bring the game to a close, and I still hate cliffhanger endings that seemingly come out of nowhere. I almost feel like one of the earlier updates would have been better place to end it, since that twist was foreshadowed much more effectively (I don't want to get into specifics since I don't know how to spoiler in the comments). I literally had a bad dream last night based off the ending events.
Anyway, as much as I'm disappointed with this latest update, I don't think I've previously commented on the game. Overall, it was excellent and I would consider it one of my personal favorite AVNs. I think the characters and their individual story paths are extremely well done. I went ahead and bought the game now that it's complete.
I'm looking forward to the sequel if you're able to make time for it. I know you said you've basically got to neglect your personal life for development stints (respect).