This is so well written and thought-through! The roll-under with success on a 1 or 2 is really interesting. What made you decide on that as a system? It makes a bunch of intuitive sense, but is quite unusual since many people think big number = good.
It's really nice to see more and more games include a section on the role of the GM. It makes the hobby so much more welcoming to new people, especially when (like you) designers emphasise the wonderful concept of failing forward.
I also love that the core conceit of body swapping doesn't stop at the initial framing of the game, but can happen in-play, too. That's a lot of fun.
But really, it's super impressive!