Thats a heavenly start, Love the establishing shot by the Synth pad or Organ instrument at the beginning that sets the mood, and the story being told by the piano. Is that a synth following the piano? Nice! Piano tells me that the child is walking/hiking/adventuring in a familiar environment, as if the forest is his playground. The introduction of the synth following the piano communicates that the animal or creature notices him first either through smell (from a distance or sight). The creature seems friendly and playfully mimics the character/player. Similar to how to train your dragon, and the ending seems open ended which indicates that this is a short animation/film/game demo.
great job creating a clear narrative around the image/prompt.