Don't be overwhelmed by the negative comments on the pricing model. To be honest, I'd prefer a one-time purchase over subscriptions too, but the recurring pricing you've kept is modest and isn't a dealbreaker for me. And as someone else commented, the monthly subscription in a way gives a sense of safety that the app is going to be actively developed and maintained.
Also I like that you've decided to keep the app usable for all actions other than adding new notes if a user stops paying. I'd need that guarantee before I can commit to a new note-taking app and migrate all my notes.
I'd echo the request of introducing mobile apps for this as well. Preferably on both iOS and Android, as I find that while a lot of folks use Mac because of their work, a significant number of them use Android phones. Also, markdown imports would be great, if it's not already supported.