First thing's first, I think that this game is well developed and thought out in terms of art, relative plot, and mechanics, especially since it's developed by only one person! I can see that a lot of love and care has been put into the game, and it definitely paid off :)). Absolute kudos to the developer for this.
Secondly, I think that Jayce's POVs are really unique, and I love that the game started out with his perspectives. I'm wondering if more context on maybe his childhood or his family will be given out later in the game just because his feelings for mc seemed like they burst a little bit out of nowhere (like it's clear he's not very mentally stable but is there a deeper reason for that or did that just come out of nowhere after the incident). Overall, his POVs give me the heebie jeebies and that's fully meant in a loving way because I like it when devs make it known that yanderes (even if romanticized) are at the core straight up creeps.
Third, for the mc, I will say that I...am not the biggest fan of her. Like many people have pointed out, much of her personality is already defined on its own. There's not a whole lot that players can actually do in terms of making our own personality choices. While I personally prefer more customizable mcs (as in we shape our personalities through choices or define our own appearances), this wouldn't necessarily be a problem if the mc has explicitly been made her own character (set name, appearance, etc.). I won't lie, a lot of the mc's actions gave me second hand embarrassment and they felt kind of immature or over the top (sorry, personal preference). The gray blob also kind of throws me off because she looks like YN from tiktok (pls get my reference), so quite goofy compared to realistic 3D Jayce.
Overall, I'm still looking forward to the direction that the game will be headed, and I had a lot of fun playing :D.