This game is a masterpiece! It's sweet, funny, moving, and erotic as hell. Yes, the models are not traditionally attractive at initial glance, but they quickly grew on me. Ultimately, what makes this story so erotic is not just the characters, but the varied scenarios and teasing dialogue. The escalation of sexual tension and activity between the MC and his daughters, particularly the younger of the two, is indeed a slow burn, but players' patience is ultimately well rewarded.
I really enjoy the artwork overall. Every scene is animated in at least some way--characters blink, shift in their seats, turn and face other characters--so there is always movement. The lighting, shadows, and focus of each scene are meticulously done. It's top notch.
The story offers dialogue choices throughout, but I'm not sure if the story branches at all. I suspect that you could desist from having relations with the daughter characters, but if you're playing this game, isn't romancing them the whole point?
The story is not complicated. At its heart it is about love and loss and how we cope with both. In its fantastical way, this story presents a touching, heartwarming, and erotic take on these deeply human issues.