Well I had rated this at 4/5, right up until I fell asleep, my phone battery died, and my entire inventory was completely wiped when I next opened the game. So not only did I lose tens of hours worth of material, I also lost a key that I can no longer get, so I cannot progress. So now I'm stuck in world 5 unless I want to restart. Which is literally months of progress. I will change my review if I receive some assistance with this.