Hey Liam, I just played through the first case twice and I found your project really exciting! There are a few janky things like you mentioned, but the overall presentation is great, and I think you really nailed the noir vibes, even with what you labeled as placeholder visuals. My favorite visual novel of all time is Kara no Shoujo 2, another detective-style game, and Noir in Hong Kong scratched the same itch for me. I hope you continue to develop this project because I already see a lot of potential in it!
If you're interested, I would love to compose a free music track for you to use exclusively in your project however you want, like a song for the interrogation scenes. Feel free to reach out to me if you're into the idea, my email is on my profile page!