The game will be built on a similar principle to BARS. For most of the game, you'll have access to all LI and side-characters, but closer to the middle of the game, you'll need to choose specific relationships. However, that's still a long way off. And it doesn't mean these relationships will be strictly classic - there will be FFM relationships too. As for who's the main love interest, I'll write about that in more detail in one of my upcoming Patreon posts.
Now, about the number of chapters... Well, that's an interesting question, since I don't have an exact understanding right now. I think around 12 episodes, give or take.
Episodes will be released as they're developed. I'd like to say there'll be 3 a year, but I'm afraid I might not manage that number. More like ~2.5, meaning 2 complete releases and a partially done third. At least that would be pretty good. We'll see how it goes in reality.
You can be sure that I've written all the game dialogues myself. Though for their English translation, I used AI help. Maybe that's why you got the feeling I was using GPT. Unfortunately, my plain English is still far from perfect, so I have to use such tools.
The blonde from the poster is Blake's girlfriend. And yes, she'll be an important part of the upcoming plot.