"The film received positive reviews in its countries of origin, with Barry Hertz of Canada's "The Globe and Mail" writing ""Room" is a film of tiny little miracles," finding it uplifting, praising Larson's performance and referring to Tremblay as "a wide-eyed wonder who is always genuine".Chris Knight for the "National Post" called Tremblay "preternaturally talented", and said "Room" "works on a tiny canvas, but in doing so it emphasizes that great things can be accomplished in tight spaces".