I enjoyed the premise of the game mostly taking place during a single, time-sensitive interview. You did a really good job of presenting quite a lot of worldbuilding info in the case files, without it being overwhelming. This felt like an interesting companion to the ace attorney sort of genre, so good job!
Your writing/characterization is engaging as is, but I think I would've felt even more suspenseful if, instead of having many of the question options all available at the beginning, it were even more tricky and you had to do more to unlock new things to talk about. It might even be fun to include some more details in the case file, so that you could catch him in a lie if you're paying attention! (If there is already a moment like that, I didn't get it in my playthroughs haha).