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…
If I might make a suggestion related to the gaps that you mentioned that motivated the tool...
It's hard to communicate the real importance of learning scales and chords at the same time. Specifically, learning all of the important scales and then building chords from those and finding more fingerable/playable voicings for them. Even going as far as removing strings and still trying to complete the scales/chords and then alternate tunings, etc. It's really a slow grind that there's no shortcut for.
Most players skip a lot of this important early practice because it's about the furthest thing from playing songs on the guitar like they want to.
Doing something like classical guitar lessons might be extremely helpful/humbling. Variety also helps -- I got a lot better once I started playing in multiple tunings and different kinds of guitars (#strings, baritone, etc) -- heck I'm learning the Stick right now.