Kinstones, figurines and hearts
Revisit towns after each major item and fuse available Kinstones. Follow the map animation to the opened reward instead of counting a fusion as a collected chest.
Save Carlov's shells for figures still missing from the collection. Some figures appear only after the ending; finish the collection to access its associated heart reward.
Use the Mitts, Flippers and Cape to revisit previously inaccessible caves and ledges. Track heart pieces separately from the full containers received through special rewards.