I've played both games you mentioned, OOT was a bit too western for my taste so i didn't complete it but i completed AD's lastest update, both are pretty good in my opinion.
And as someone who pretty much played all of those, i'll agree Dissonance is the lightest one, a claim really pushed by the fact it's probably the only one without a depressed protagonist. Another LiL-Like i recently got into is Kaleidoscope, but that one kinda suffers from wanting to be too much like Lessons in Love without actually having the courage do what Lessons in Love does.