The iOS version is currently unavailable.

Since Apple is mandating game makers to update their Xcode and SDK, there are unexpected errors in the compilation, so iOS is not available at the moment. We will try to solve the problem as soon as possible. We will try to solve the problem as soon as possible. 

In the future, we will most likely stop providing the iOS version, so please back up your save data to the cloud.
And you will be able to play on other platforms.