The writing is nice, and as the central point here I feel like focusing on that was the right move. I get a pretty good idea of the character between Guy and Minerva, and capturing that well within a limited time frame is pretty impressive in it's own right. Would have loved more in the way of art assets; backgrounds, UI and UX elements during the VN sections, more portrait art, but as is it definitely gets the essentials across. More in the way of audio design and music would be great as well.
The 3D sections are rough, admittedly, but as a proof of concept it's very neat. Having the combination of VN and FPS gameplay is neat, and would love to see it expanded on.
I'm not a fan of AI art in general (consider it moral grounds, haha), but for a solo dev it's understandable; having it as a sort of blueprint-y foundation works, and in a game jam game I understand it, but I would love to see actual artists giving a take on Minerva.
Overall, I like what you're doing here, and would love to see more in the future. Good job!