Some mindbending ideas here, though the order of the levels feels mixed up. For example, level 5 feels way more difficult than the ones that come after it, and I think some later puzzles actually do a better job of conveying that mechanic.
Still a good jam submission though, I think this can be explored further if you really want to.
Just to confirm, (ROT13) fjnccvat n obk sbe n punenpgre (ROT13 end) is a step for level 5 (now 6), right? I might be overcomplicating it.
If true, then I think it is still too much of a leap for the player to take. Maybe it is nicer to have that level near the end where you (ROT13) arrq gb fjnc n punenpgre sbe n obk (ROT13 end) at the front so that the player could have a clearer objective in mind and also has a smaller possibility space to experiment with.
