That is in fact the same than some other co-op game and it is in my opinion the smartest one. Just a question, do you make any difference between solo games and co-op game (I think not but I want to be sure) I mean can you begin a game alone and then a friend join your game at your savepoint?

"-Oh that's fullmoon, cuttie cuttie sheep
-baaaaaaOOOOORGH"
***Sprotch***

Weresheeps will rule the world (At least one night every 29 days)