If your game interruped its activity during the tutorial (game crash, game closed, visit a second app, etc.), it could suffer a known issue where your playing screen will appear blocked at a certain point.
 
The team has already fixed this issue, and it will be included in the next version of the game.
 
In the meantime, please contact us and send your user ID so we could fix it manually from your panel. You can find it on the top of the loading screen. It looks like: gamename0000000.0000-00000000000
 
We strongly recommend you not to stop the game during the tutorial to avoid this rare situation.