I just bought this game the other day (since the last update).
I had a great time playing for a couple of hours. Then I restored my iPad to factory settings and restored my backup (as I do intermittently to clear the “other" space in my storage).
When I ran it again I was faced with choosing a character and starting the tutorial again from scratch. I tried reinstalling - and still had to play the tutorial - though it did remember my character choice. On getting through that I found all of the levels I'd unlocked were still unlocked and I still had all of my cards, but all of my levelling up and, and attack boosts, portal time and money had gone.
I hit reset and started from the beginning - and I tried out using Battery Doctor to clear my junk - just to see what would survive. Now whenever I collect money in the game, I get a red bar appear on the screen for a moment. Although I've collected cards and can get them before I go into battle, the actual card list itself shows as empty.
Is there any point in playing this game at the moment? Especially considering that I'll be restoring from a backup again in the next month or so when I upgrade my iPad? I don't relish having to start again when I do.