The film says as much in its Ziggy Stardust - inspired opening title card: «Although what you are about to see is a work of fiction, it should nevertheless be played at maximum volume.» (film.avclub.com)
It's Scott Pilgrim Vs. the World's kid brother, brimming with the same sort of energy and charm (and the same 8 - bit opening title card). (alphaprimitive.com)
Except for a short sequence following the opening title card, we are never allowed outside of the main characters» apartment building. (reverseshot.org)