The whole game dynamic is incredible, and the secret roles being different from the main roles gives some replay potential at least on GM side.
As usual, make sure players know what they signed for, if they're into miniature combat it's not the game for them. If they look for a emotional role play heavy game about a family dynamic that's a must play.
Note that the first act feels a bit slow, but it really helps building the dynamic to have a strong game during second act and tears during final scene