From the introductory materials:
Parlor Larps are designed to provide maximally accessible, artistically satisfying LARP experiences to a relatively small group of 4-8 players and 1 Director. All require little or no preparation, a normal sized living room, and take 4-5 hours.
Parlor Larps are intended as something more than "just a game." While they are certainly a leisure activity, they are meant to be thought of as exercises in art as well as entertainment, and in that sense are more like theater games than board games, or even many traditional LARPs.
Like a play or novel, they are designed to provide an experience, provoke an emotional response or make the participants think. While elements of entertainment, fun and challenge will certainly be present frequently, many of the Parlor Larps are not, and are not intended to be, entirely pleasant experiences (a successful portrayal of a frightening atmosphere is rewarding even though everyone is feeling frightened). These LARPs will be much more successful and enjoyable if all participants keep this goal in mind.