Something I don't think I've commented on but which I think deserves mentioning is just how many of the girls are bisexual and the way they're bisexual.
It's not uncommon for harem games to have some of the love interests be bi, but frequently the girls aren't independently bi for their own sake. Sometimes they won't really be bi but play with some of the other girls purely for MCs benefit, or other times they'll only realize they're bi after getting with MC which isn't a bad thing in and of itself so long as it's handled well.
But here, not only are a great many of the girls are bi, but loudly, proudly, and independently bi. They're bi long before they ever met MC, they will continue to be bi whether or not they're in a relationship with MC or not. That's incredibly gratifying and heartening to see as a bisexual myself. The girls like Ruth, Gloria, and Tanya (are all the Sisterhood girls bi?) make Evelyn and Lucía exploring their bisexuality feel much more grounded, that while both girls are sparked into exploring it by involvement with MC it doesn't feel synthetic and like it's purely for MC or the player controlling him. Yes both Evelyn and Lucía have explicitly stated bi backgrounds, but never had ever really acted on it before, the important part is how naturally those stories and their actions are integrated into their characters