Hey congrats, this looks great for macOS! Trying it now!
With a similar mindset and an Emacs background, I wanted a scratch-like experience on iOS, so I built one https://xenodium.com/scratch-a-minimal-scratch-area. Seems to work for others too https://irreal.org/blog/?p=11202
While there's a new built-in iOS journaling app, I'm building one to save to plain text (and no lock-in). https://xenodium.com/an-ios-journaling-app-powered-by-org-pl...