indeed, would suggest you do like me, and hit save on every decision that might look like a possible branch in the story. the game is very patient with the number of saves (i don't even know the theoretical max number of Ren'Py saves.. is there any?), just if you individually name each single one, there might be some struggle ahead with the name length. can't have a lengthy explanation as save name. i didn't count lately, but i'm at around 20+ or so pages full of saves.
..right, should clean them all out some day and just replay the whole thing. seems worth it.