Has anybody seen Zennotes (https://zennotes.org

I stumbled across something I thought "yawn, yet another Markdown-based note taking program" and watched the Youtube presentation with not much in terms of expectation.
https://www.youtube.com/watch?v=661XzULWfVU&t=278s

Boy, was I wrong., I found myself nodding throughout the whole video. See for yourselves, I am not a frequent shifter but this deserves some attention (Mac and Linux only for the moment, I think)
The source can be found here (https://github.com/ZenNotes/zennotes