Yeah, I have a deep game development background (both in industry and as an indie dev), but I've also worked closely for a number of years on building learning game prototypes with education professors from UW-Madison and CMU. So this is a space I'm super interested in.
I actually had added a comment that I ended up deleting about Duolingo (and Dragonbox, another educational game that I think structures learning pretty nicely). I was going to add the reference specifically because of their spaced repetition and incremental addition of skills, but then I deleted the comment because, well, those games are pretty elaborate, too, and I was mindful of the scope you looked like you were aiming for.
TBH, Im so high off of building something that finally gets some traction instead of sinking into oblivion that I'm freely making grand plans of building elaborate features instead of aggressively limiting scope like I really should. Oh well...this will fade anyways, let me have my dream roadmap for now.
I actually had added a comment that I ended up deleting about Duolingo (and Dragonbox, another educational game that I think structures learning pretty nicely). I was going to add the reference specifically because of their spaced repetition and incremental addition of skills, but then I deleted the comment because, well, those games are pretty elaborate, too, and I was mindful of the scope you looked like you were aiming for.