While the film seemed to suggest a platonic relationship there are times where they seem particularly close and comfortable with each other such as the arm grab and the "I know you love me" comment at the end. What do you think?
Possible evidence
Official spotify playlists for various characters from the film
It's clearly a story of forbidden, interspecies cartoon love and flies in the face of traditional convention. So progressive! It's the Carol or Brokeback Mountain of 2016, tbh.