I want to congratulate the author for the story and characters. I was starting to read the VN and at the beginning i was like "meh"... lets see how bad it turns... and then it started getting better and better. Why the meh, you would say? at the beginning of the novel the graphics are so bad that I almost ran away. Anyway... I like what you have done with the game. I will gladly support you in the near future.
A little bug -detail I found was the options when you will get a NFSW scene, it always says MC x some1. That would be a nice idea to remove (to allow you to get a little more of surprises). I know you are giving a heads up of "you are about to see some porn, save now or something" but I dont know.
Another good idea I can give you is to put penetration and x'ing sounds, moans also. DO NOT add voices (not only is too expensive but f's the game, ok?), and something very exciting I have seen in lots of VNs is the exact moment of the pentration that is very nice to see.
I hope your game continues to grow and you keep making it great.