Love the game, but... – Castles of Mad King Ludwig Review

So I purchased the mobile game and loved playing through the campaign. Liked the play of the open games. But after having the game for a couple of weeks I tried opening the app and got an error message that said something to the effect of, "pairs set came back null." And the game would not open. Even after powering off my phone. Deleted app an reloaded it, and now I have to start the campaign all over again. Would love to give a higher grade but, game failing to open bugs are a bit of a downer.
Review by Lumric on Castles of Mad King Ludwig.