Yeah, I've been thinking along these lines too. I think it could evolve into something more substantial with a few additions to the UI. I've found myself wanting to store more and more notes in it, but then I run up against lack of page organization. I don't want it to get bogged down in folders and tags and such, but I have some ideas to strike the right balance. Thanks for sharing your thoughts.
The distraction free workflow with timer motivation is a really killer feature. I wonder if you could handle the longer term PKM / organize / retrieve kinds of use cases by integrating really nicely with tools that focus on that, like Obsidian?