I like it, my first reaction: wow, level zero is hard. I would rather have level zero not time-based. Or at least slowly fade-in some hints (like show another random note on the fretboard for guiding).
Try the practice area, it has no timer and you can select strings and notes to focus on. And stay tuned and sign up for updates if you can, I'll build a kinder, gentler learning module to go with the game