This story starts out very strong. All the technical aspects of the VN are top-tier: art, menus, music, formatting, editing. Marcus is a terrific character and his relationship with Tomasz has the strongest writing in the story. The opening is mysterious and exciting.
[spoiler]
After that, the story seems to lose direction. The relationship of Tomasz with his father doesn't feel real--they seem more like roommates. You'd never guess that Tomasz lost his mom if the story didn't spell it out. The scene with the fox woman at the store seems pointless, and Tomasz seems oddly nonchalant about the gangster-ish guys looking for a friend. I'd expect him to be scared and on the phone instantly to try to figure out who they were & what was going on.
There's a jarring genre-shift with the appearance of Dawid. We know Tomasz has mental problems and severe anxiety and several scary/overwhelming things have happened/are happening to him all at once. I'd expect him to be very suspicious or distant about Dawid's sudden reappearance, but instead he instantly turns into the protag of a (perfectly good) dating sim.
It feels like Tomasz is the focus of too many different narrative threads at once. The character gets no breathing room to develop because the story is constantly dragging him into yet a new plot.
Hopefully with greater length and more editing, most of these issues will naturally resolve themselves.