Wow, some very nice words, thank you.
I'm intending to put together an actual play that shows the tools in use. I know what you mean about mental fatigue; I'd say more about it but I haven't solved that myself, yet. Basically if I end a session on a good note, I'm ready to play again very soon. And if it's mediocre, I find it hard to get back into it. But I think that's true about any solo RPG.
Regarding memorization and mental grids, this is a big subject. I've studied techniques like the Method of Loci, and the Major System. While worthwhile to learn, and a fun party trick to recite 100 digits of pi,it's overkill to learn them JUST FOR HANDS-FREE. If I could come up with a simplified version...
As for PWYW, I intend to put up a donation box after Hands-Free settles a bit more. I keep making lots of changes. I'm glad you learned the acronyms, but you know know I'm actively considering changing some of them. I think "BEGINS" needs some more work. I've also been toying with a better genre randomizer.