Sally Jane Black’s review published on Letterboxd:
The film shifts between moments of carefully illustrated wonder like sea creatures gently flowing through the aquatic deeps to cartoonish distortions like Ponyo's body transforming magically, blowing up like a balloon. It's never seamless, these shifts, but it's not jarring either. It's softly startling sometimes, but mostly, it's like a burst of happiness amidst clouds of euphoria. Blue waters, green forests, soft bright warm golden lights fill your eyes and arrest every neuron, demanding you drink in the rainbow of delight. No wonder is greater than the arrival of the sea-mother and her incredible caresses. Somehow this film takes a very localized story--it never leaves the town/sea near it--and makes it seem so huge with the fleet of lights, the awesome undersea panoramas, the pure magic of it all.