I should preface this review by saying that I feel oddly protective of this game and its creators. I've played every route in the first installment of Cinderella Phenomenon about 20 times for free and have had countless hours of enjoyment from the series, so I was definitely ready to pay $10 for the next installment of the game. Honestly, this game feels more like bonus content for the first game than a separate game, but I’m ok with that. I’ve logged 50+ in the first game without paying a single cent, so for me, spending $10 for a bit of extra fluff content with my favorite LIs was more than worth it.
Do not expect an entirely different game- it is very much a (delightful) continuation of the first series. In my opinion, you need play the first game before beginning this one, as it provides necessary context to all of the routes. If I didn’t play the first game, I may doubt the price, but again, the first game was free and I feel completely comfortable paying $10 for bonus content for a game I have enjoyed for so long.
TLDR: The price is worth it if you enjoyed the first game, which is completely free.