I did once a similar project, but for Mac only. The project was not successful at all, maybe I didn't market it properly, but it seems people don't know how to use it (it needs a lot of determination from a user).
Now I'm thinking of pivoting this thing, maybe someone want to collaborate? The siteL https://motley.place, sorry but the intro video is in Russian.
I was so distracted by other apps that I created an anti-to-do list application for myself (no features or notifications, etc.).
If somebody wants the simplest possible to-do list at the menu bar, I'm running a beta test right now; https://vanka.me/redline