CardNotes - Zettelkasten + Handwritten App

Hello everyone, I'm Vince, the creator of CardNotes. I'm a reading lover, I like to learn new things, so I've been finding different notes taking methods, and I finally discovered that I really like the concept of ZettelKasten. And I also found out that most of the Bi-directional linking apps are typing, but I like handwriting. Unexpectedly, there's no handwritten app with Bi-directional linking(at least in my search), so I made it - CardNotes. What do you think? Have you had similar needs?😄