We've received some reports where the players were seeing black screen after the ustwo logo which prevented them from playing the game. We believe that this is happening due to disabled storage permissions. So, if you are experiencing this, we kindly advise you to enable the storage permissions for Monument Valley 2.
To do so, you can check the link below and follow the steps:
Hope this helps! :)
If it doesn't, please don't hesitate to contact our support team.