Oh, no, I just added 1 extra interaction in the game %'3 Just to help out a player who might be missing some but still wants a True Ending, because I think my game isn't the kind where you should be forced to go and get every collectible!
Yaaa, I guess you did! Mysterious Shell picture has every Item-related Blue Cucumber that you can miss lined out - additionally, you might have missed a reward conversation with some NPCs, like the toothy guy you save from Dream World!