I get more and more used to the game and the interface.
Regarding bugs, it works more stable on an iPhone 6s with low details and crashes from time to time on an large iPad Pro with high detail settings.
It crashes always within the inventory menus. But with the recent updates it got a little bit better.
I’m very thankful for the saved game management. It let me switch between both devices easily and allowe me to play and try things, since I can move to a backup.
So far it starts to be a good mobile game.