For bloons TD5 is it possible to link a Ninja Kiwi account to my app on my iPhone?

I have been playing Bloons TD5 by Ninja Kiwi on my iphone for sometime now and I had always assumed that the only way to play bloons td5 was through the app. So like five minutes ago I went to their website and found out that all you need to do make an account with Ninja Kiwi to play the game. So I did, thinking I doubt I'll be able to link this to my iPhone progress. Obviously I was unable to and am wondering if anyone has an answer for me.

No you can only use your game center account for the iOS version. However, you can use a ninjakiwi account for btd5 online to save your game and all that jazz