[hrktb]

> I see some features that seem to address some pain points of Japanese users, so maybe that demographic will be more interested

Definitively. The three selling points are explicited as "OSX only", "Japanese friendly" and "open source".

Anyone who doesn't care about japanese text encoding is out of the targeted demographics (it still can be interesting in other contexts, but that might not be in the author's priorities). For anyone in the demographics however, it would be a solid replacement of Textedit or any other "casual" or prose oriented text editor.