[@Penny]
Can you expand a bit on how you expect the "collaborative RP" aspect to go?  I haven't gotten my hands on Lovecraftesque yet, but my understanding is that it has no GM.  Everyone takes turns telling part of the story and there is only one main character. Everyone provides a 'clue' that gets wrapped up at the end of the game.

Are you going to provide the setting and plot hook while we describe our actions and provide a clue?  And we all discuss how the clues fit together, with you deciding on which theory to go with?