Hey, thanks for the kind words and I'm glad you're enjoying the game! :)
Gwen's Yandere aspect hasn't been fully fleshed out yet, but it will be. Right now there are three "stages" of ever-increasing Yandere-ness, and to activate them you just have to not do naughty/romantic things with her. It'll take a couple of in-game weeks to hit the current maximum level, but you'll know it when it happens ;)
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Indeed so! I just got the scene where she comes into the MCs bedroom at night with a knife. I did love it, though I wonder what her 'broken' quirk does? Anywho just for a heads up, is that the latest yandere scene up to date with her? Just so I don't go indefinitely searching for another one only to later realize thats all thats been released so far? :)