I don't often review things, usually only when they are bad, but this was so perfectly to my tastes that I love it. I only have 3 gripes, all of which I'd say take only 0.1 points each away out of 5.
First is the general, development is slow. I would say this is a big problem, but there's A LOT of content, so it's all good. The content is also so good, that I can forgive it almost entirely, but since I'm always left wanting more, I can't ignore it either.
Second is the number of side characters. If you are into that, that's fine, but while the main family is 2 already, that's only the beginning. There's also the aunt and the cousin when it comes to incest fetish, which are both amazing as well. But beyond that, there's 4 teachers, I think 2 extra school staff at least, multiple classmates, several random people you meet through out the town for various reasons, multiple divine beings from demons to angels and I've lost count.
It's... great, but a bit too much when I wish the main cast got more focus. They get plenty, there really is a lot of content, but... still.
And the final is gameplay. It's there, but it's mostly a linear story with several side stories that you need to do to continue the main story and there is also optional combat, but it doesn't really add much. Not the greatest sandbox mechanics wise, but it's not a significant problem either, so again, it's fine.
Everything else? I love all of it. I usually hate horrible proportions, but the art style is JUST RIGHT that it works in most scenes perfectly, the story is amazing and I want more, the characters are either lovable or interesting, it's all great. Either play this or wait until a future day once it's maybe one day finished to experience either a masterpiece or something that really seems to be on it's way there.