So, let me start by saying that I see potential in this project. I am going to try to offer some constructive criticism, especially because I know this is still early and it's definitely not easy to make a VN. So, I hope this is taken in good faith, as I really want to see this thing succeed.
First off, I noticed someone below commenting on a grammar pass. I agree with this, and particularly want to highlight the fact that the vast majority of sentences don't have any periods to end them.
More than that, though, I think that a lot of the text feels unnatural. There isn't a better way for me to explain this, other than to say that it feels like a lot of the dialogue was written by someone who does not use English as their primary language. I don't know if that's true or not, but having someone recite the lines aloud and seeing when the dialogue sounds awkward would probably help a lot.
Something else that might help with this: don't be afraid to combine multiple sentences into a single text box. There are a lot of instances where multiple lines are delivered by the same person (whether it be a character or the narrator) but they're divided up into multiple boxes. Sometimes this is good artistically when a character has a significant pause or something, but in casual conversation it just makes their conversation come off as choppy.
Last point I'll make on this is the introduction of the pandemic. I get it's obviously inspired by the recent Covid 19 pandemic, but in the novel it's not explained and appears to come out of nowhere. It might help to, for example, have a conversation with Terry on the first day, where he comments on the news of the new disease reaching their country. Then you can follow that up with everything closing down a couple days later.
I hope this isn't taken as entirely negative. Like I said, I see potential in this and just am offering some advice. On more positive notes, I do like several of the characters (Terry in particular is great) and the more fantastical elements definitely caught my attention. I am interested in seeing how this develops, and I hope this one improves and takes off.