Hi! I am enjoying the game so far! Also got the problem with freezing unusable phone on Mac, going to the menu and opening any other app (browser for example) and then returning to the game helps.
Love the achievements, I am on the way to getting all of them :D For 100% completionists like me it would be cool to add some kind of gallery/archive of all possible doppels variations for each character that opens gradually as you encounter them in-game. I bet we're not gonna quit until we get em all