You might consider starting with learning the open strings, then the first fret, then second, etc. The way it works now requires a level of expertise beyond what beginners are likely to have. But the idea looks great!
you're totally right. I'm an intermediate player myself so I kindof built it with an intermediate bias. Did you try the practice mode? There's no timer there and you can filter it by strings and frets so you can focus on a small area of the fretboard at a time. But yeah, as I mentioned in a couple other comments here, I plan to build a gradual learning module using spaced repetition that starts with a few notes at a…
EDIT: it's only after you choose a level - you can 'start' or 'practice'. gotcha.
EDIT2: alternate tunings seems to be a logical step. is that on your roadmap?