This is a meditation into the life of a lost soul. The slow pacing didn't bother me that much since it did play into the so-called "nothingness" of the protagonist. I truly feel for him even when he did the worst deeds.
Ultimately, at the end, just when we couldn't ask for more happiness for him, he decided to be alone without anyone in his life. As sad as that might be, there's also something poetically heartwrenching about it.
And Felix Maritaud's performance as Leo was excellent. It's a travesty that he was not recognized for any of the major awards like the Oscars.
I, myself, couldn't believe that he is also the same actor playing the adult version in "I Am Jonas".
I have high hopes for this guy and hope that he would break out into more well-established features on an international stage.