I just went through all the content and Jayce is a delight. He's so unintentionally funny at times, and let me say, I love that he's still a virgin (virgin ML for the win!).
His POV is the best part of the game, hands down, and I like it a LOT better than when we're in the MC's head. I like how unhinged he can be and his reunion with the MC was great! Right now he's the perfect mix between dangerous and a puppy in love. I was a bit more ambivalent about the Act 1 - Part 2.
The only thing I wish for, is that we'd influence the MC's personality a bit more through choices, I'm not clicking with her. But I understand that this is a passion project and you're the only person working on it. The MC isn't why we're here anyway, and Jayce as the product is great!!
I'll looking forward to the full game. It feels so special to see a VN for women with 3D models, I hope your game thrives and becomes a classic for yandere enjoyers!
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Edit: I wanted to gush more now that I've realized the rest of my comment gets hidden under a cut, so I can talk about some spoilers.
I really like how you established the source of Jayce's obsession. The intro was genuinely unnerving and as the reader, you feel scared, sad and then moved by him. One can understand how he ended up latching onto the MC. Him deciding to become a better version of himself felt strangely close to me, I got into working out because I wanted to be pretty for my husbandos when I was in highschool, lol.
And the scene where he got his vengeance against Mac, UFFF, I got chills!! Him pissing on that man was a hilarious choice, and tied everything up with a bow. My fav line there was Jayce saying he felt levelheaded, haha!
Other thing, I like how he's focused on marrying the MC. Like, yes, wife her up. He doesn't want to be a boyfriend, he's coming for the husband tittle.
And I love how his geeky personality peeks through.