Old-fashioned and full of well-worn clichès (down-on-his-luck boxer, estranged father-son relationship, young boy forming a bond with a sentient creature etc.) but I found it charming and compelling regardless. Reminded me of this Japanese TV series called Giant Robot that was on TV when I was a little kid that I absolutely loved. Plus, I love how the film completely ignores all the custody battle stuff that I was expecting would weigh down the ending. No villains and no silly character transformation stuff. Just fun robot boxing.