the way you use Dixit/Mysterium cards is a really cool way
i guess, if i play your game, i'll just change one thing: the title "winner" would be replaced with something like "chosen dream-storyteller of this night". Maybe also the game will finish with a new turn. A sort of collective dream, where all players should create the Final Dream/story (similar to exquisite cadaver, or to Aye Dark Overlord-but with good intention)
I think it stays in the mind of your game, but it could gave new options which would be better for some specific players who prefer a collective narration and a "Final scene"
thanks for your game :)