By saving your account on the Cloud, you can transfer it to a device with the same OS by reconnecting to your Game Center or Google Play account on the other device, as long as you have saved your game in the respective cloud following the guides below.
Cloud saving on iOS devices
You can use Apple’s Game Center to save, recover and transfer your account to any iOS device:
Go to your device settings and scroll down until you see "Game Center". There, tap on Apple ID. If you already have an account, simply log in. If you don't have an account yet, create your own new Apple ID. Enter Nonstop Knight. The game should now force a Game Center pop-up. Please follow the instructions on the screen to connect your account to Game Center.
From now on, your game progress will be saved automatically via Game Center.
Cloud saving on Android:
After installing and starting Nonstop Knight, you will be asked to select a Google account to which you want to connect and save your game progress. Please select your desired account there. If you don't have an account yet, you also have the possibility to create one. You should also make sure that you are logged in with your Google Play Games account in the Nonstop Knight community menu.
From now on, your game progress will be saved automatically to the Google Play Games cloud.