This seems bizarre. If the game has a compartmentalized level structure (complete with overworld map), how do you get someone in a position where they don't know where to go next? Unless individual levels are extremely nonlinear, I find it hard to believe.
It could be from the fact that you need certain stickers to progress and that you need to backtrack to previous levels to find/use them (in some not-so-logical places), so I could see where some reviewers might get tripped up.