Don't worry. I'm thinking of ways to make this game more intuitive, specially save/load system. I would really like to make the codes save locally instead of copy and pasting a code. For example, when you click save, the code is saved in your browser locally, as you said. But also, to remove possible data loss (for example when clearing history data), you could get a recovery code, just in case.
Any more ideas, suggestions or anything you have, are welcome.
Also, the save/load functions, as the cloud transfer system, aren't very updated, so coins, achievements and stars aren't saved (yet).
PD: About cloud transfer, you are right. I have just realized it isn't working. I will try to understand why and fix this when I have a moment.
Right now, I have tried to fix, but I think this will take some time.
The save/load functions are now saved locally, but you get a recovery code directly to your clipboard just in case.