I've tried really hard to like this game, I like sandbox games, I like building harems, I like interesting, we'll written characters.
Why not?
The two big issues are it's very, very grindy - which gets boring fast. And if you're working towards a particular route, it's far too easy for that route to get blocked (characters getting removed from the game, etc). And when that happens, you're back in the pain of the grind. This is because relatively small seeming things can have big, often inescapable impacts much later in the game - with no warning or sense it's about to happen. So despite being to be a sandbox, it has some really big linear elements that ruin later parts of the game.
It has other negatives - navigation is terrible, multiple clicks to get where you're going is nice to start with but gets painful with the grind; to really progress, you need the wiki rather that it being even remotely intuitive.
The positives - the characters are interesting, I like the artwork, and the game is generally well executed. The basic mechanics are interesting.
But these positives are outweighed by the negatives. Really not worth the time I've spent playing it. It's a shame - it could be great.