mumblecore?

I would disagree that it would fall under the mumblecore umbrella; as you already mentioned, the pictures are much more heavily based around composition than the genre (if you can really call "mumblecore" a genre) usually holds. But beyond that, the film itself tightens considerably as it progresses, streamlining events down to what becomes a very tightly scripted plot development that then dictates the remainder of the picture, whereas mumblecore films have a tendency to avoid the same kind of dramatics and find themselves more in the flow of casual life and non-happening. (That last phrase sounded a bit derisive towards Stockholm, and was not intended as such, I personally loved the film, and it drew me in in a way that few others did this past year). I just don't feel the intimacy in regards to characters in their early 20s is enough to place it beneath the mumblecore moniker when so many elements are directly opposed to what the Duplasses and Swanbergs of the world get up to.