Well in their defence they do have separate writers for each of their games, so I don't think that creating multiple games at once affects to the story creating process too much.
However I'm with you on the too many characters thing. With the story dividing in to so many different directions with so many characters, it does give you the similar vibes than Astaros' "My Cute Roommate 2" that the name is just there to lure in the players who liked the first one. Because so far, without some of the backlashes, we could very well just call this game "summer at my aunties".
Surely understandable that the sequel has to have different kind of story than the first one, or otherwise it would be boring repeating. But now that you think the amount of girls: Mia, Grace, Sadie, Cindy, Isla, Vivian, the therapist who's name I can't remember and now Emma...just way too many moving parts at the same time for a game like this. If there would be Season 3, I would understand it. But since this is supposed to be wrapped up in five episodes...yikes.