There’s I have some suggestions to improve the UX of the app.
It would be nice to be able to disable pop-up modals when a lesson is completed and new points are displayed. It’s quite annoying to have to close them and I really don’t care about the points, I’m sure many people would rather not have to click through this either. I know usually settings like this are not trivial to build, but would really save a lot of time for users to not have this extra click.
It’s great you have dark mode, but the dark mode schema is not very good for people with color blindness. For inspiration - Github does it well, you can have a dark theme that considers the 3 common color blindness types and tweaks the color schemes a bit.