Really neat concept. I agree with some comments that some of the rebirths felt a little like a struggle in the middle - though the balance of "real life time" to "lunarity generation" was interesting - sometimes it was faster to Dubious an extra time just to hit the stress cap even though idling out would have maximized the lunarity per rebirth.
I'm also apparently stuck at Knowledge, because pressing the Learn button a single time sends me to like e11 stress. and it looks like I need to Learn 10 times in a single life before I can get a single upgrade? Not sure what I'm doing wrong there.