hi, i am having the same trouble.
it is on my ipod touch, it is also backed up to my icloud, my ipod touch is now the current ios and the game is unplayable.
apparently this game isnt still playable without interruption and it seems the old ios was the last system version to enable playability, i.e. "supported" might translate to "handles" or "allows functionality." while i did not play this game frequently, i did have the urge to play it yesterday and after trying to figure what's wrong, i arrived at this thread today.
I think its a shame that the ios isnt backwards compatible with older apps like this. i also think its a shame the game isnt being kept up to date. so many wrongs, so few rights. what's the game owner left to do but discard it as its nothing more than unusable data taking up space that could otherwise be used for other apps and ios updates. so theres really no point in even having a backup of this app. all around, i am rather disappointed...
