The reviews lean towards qualified approval of Kensuke’s Kingdom, with praise clustering around its hand-drawn landscapes, environmental themes and emotional warmth. Critics respond to the castaway story’s old-fashioned appeal, while several find particular strength in Kensuke’s backstory and the animation’s treatment of memory. The conservation message is generally seen as effective, and the connection between the central characters gives the adventure a tenderness that even the more reserved notices acknowledge.
The spread runs from enthusiasm to modest approval, with no outright negative verdicts, but critics differ over how fully the animation serves the adaptation. Little White Lies finds it too faithful to the novel and insufficiently inventive visually, whereas Sight and Sound praises its imaginative animated drawings and memories. The Guardian thinks the storytelling sometimes softens the danger. Deadline, by contrast, praises the suspense but warns that the stark wartime material may make it less suitable for some families.