Oh god don't mention the Sonic stuff. Not again. Not agaaaaain D:
Lessons do look fun, which is nice. SP had some very nice gameplay ideas occasionally marred by poorly thought out execution (I'm looking at you, lyric lessons. Yes, rotation is a cool way to throw people off, but not when the things you're rotating aren't vectors. Uggggggh.) and this seems to combine the best of the original and SP.
Also, I don't think there's been a sub for PV6 yet, right? In which case allow me to self-advertise a bit:
http://www.youtube.com/watch?v=pHVW-f25gTE and post a subbed version. We also finally bothered doing our own ver of PV4 but as domelola did it already I doubt it's worth posting. :w