Dagur Kari's other movies were fantastic, I had my expectations really high for this one. It starts really good, with great acting by Dano and Cox, and a kind of "dark" aesthetics (almost medieval) that works great. But somewhere along the way the film turns out just to be nice, losing some of its starting potential.
Paul Dano like Buster Keaton, Brian Cox like a Beethoven sonata, and Estragon the goose, like a goosy character from a Beckett play. Dagur Kári, at his best. ('The Dark Horse' was too crazy and nonsensical, and even after all they shoot horses, don't they?, while 'Nói albínói' was depressing, cynical, too baldy and too much Kierkegaard). 'The Good Heart' is the real thing with a big heart in the right place.
The ending made Lucas & April characters mere pawns, whose only function in life was to bring life into Jacques. The slow exchange of "good" and "evil" between Lucas and Jacques is a nice and simple idea, but it doesn't work well with the ending. Why? Because Jacques was a much more interesting character when he was "evil", and his dreams, which eventually came true through the death of Lucas, are lifeless and banal.
Simple and yet deep story. The script is fantastically wonderful, I can even remind sentences of it even now (Life is a coconut, hard from outside, while it has juice inside). Brian Cox and Paul Dano do their best conforming a bizarre tandem. I loved the end, it makes the title the most original in terms of story. You can find it the best example of how to make the best with the least.
Oddly endearing film ultimately done in by an obvious and cloying conclusion. Brian Cox is fantastic, though.