Thanks for the kind words!
We wanted to give the player complete control over the order in which the story pieces unravel.
We did keep the part where things go wrong behind more difficult puzzles, both because we wanted to encourage players to try and face simpler ones and unravel other pieces first and because accessing these memories should be more difficult for the in-game character, mentally.
I am curious though, would you do it so that you have to unlock at least one puzzle before moving to the next folder?
Maybe... that some puzzles require a specific amount of solved puzzles before the player may see them?
I do find it kind of overly restrictive but this could have a positive affect on the player's perception of the narrative.