Honestly Great
Let's face it, the ads make this seem like a shallow attempt to earn lots of money just for some attractive 2D girls, but this game is actually more than that. The art is genuinely nice and the overly sexual designs aren't shoved in your face immediately. It's an Idle RPG so the gameplay isn't deep but it's a fun Idle RPG. And it has a few side modes like a wave defence game that I actually love. My only complaint is the translation isn't amazing in the story, but the voice acting itself is pretty decent (at least in English; I didn't try the other languages) It also gives you a lot of summons for free, unlike other gaccha games, you don't feel forced to pay to win.