I don't know why the last two episodes of the season (Mazey Day and Demon 79) are not Black Mirror, they're fantasy episodes, they seem like taken out from another series (Like Del Toro's cabinet of curiosities) and put them here.
Mazey Day was plain bad, boring, pointless. But I actually enjoyed Demon 79. Even though it's a fantasy episode it's very entertaining, solid story, I loved how it ended, performances were great, Anjana Vasan (Needa) and Paapa Essiedu (Gaap) have a lot of chemistry together, it was a fun and enjoyable episode.
Still, I don't know if I want these kind of episodes in this series, I want to see Black Mirror, not this, not fantasy episodes. This is not why I watch Black Mirror.
Maybe... why don't they just create a new series?