I only discovered this game a few weeks ago, and I am a Patron of it, although I can't afford too high a level with it. I think the renders are really pretty hot, and far above what I've seen in some other games I've checked out recently.
There is a lot of grind in the game. I feel like it's heavily influenced by some Hentai dating sim games, like True Love and similar ones where you keep cycling through days. Or maybe it's like those slave trainer games, too? The grind wouldn't be that bad if 1) we weren't playing the damn game so much and 2) we're not always sure where our grind is taking us. Think you're making progress? You honestly can't be sure.
I think a problem for a lot of people though is that we grew to live the female characters when we started to play the game. They all had different personalities. But the more the game went on, the more they get changed, until they're no longer the same characters. Lisa is no longer the little-sister archetype, for example. I want the sex with her, but keeping her personality-wise largely what she was at the beginning.
Someone alluded to not needing story and stuff. I would argue that for incest games, that is critical. You have to know about the characters. You have to get that feeling of the various family dynamics and let the family members actually feel somewhat like family members to you, so that it actually feels slightly wrong to lust after them.
DS has a pretty decent game here, and kudos to him for making money at it. He could put a little more sexy earlier on in the game, and offer alternatives to those that don't want to corrupt their relatives, but other than that, I wouldn't change much. I hope DS continues to do well, because then more and more people will attempt to follow in his footsteps, but hopefully not stumble as he has occasionally.