Okay I beat the game (true ending). I'll play it a bit more but it's like 4 hours which is not a fantastic match for the price.
That said it's good. The process of uncovering her backstory is nice, and the story's a pretty good one. Pretty much every puzzle is bullshit but I ended up getting them all without guidance so they can't be that bad. And there's a cute waifu-raising aspect to the game, with giving gifts, moving the camera around, and her occasionally starting a conversation with you if you're not doing anything else. Olivia best girl btw.
But I do wish the personalities got a little more interconnected than just a cross shape with Sofia in the middle. You have to use Olivia to get Isabelle's pendant at the start but that's the first and last time two non-Sofias interact. There's also how the very first puzzle requires google but it's the only one that does, which is weird.

All in all I would rate the game 8/10 if you get it for free.

Sofia... had a hard life...