if you have an android tablet, there is an APK you can install! it is provided in the downloads
Oh okay! Nobody has built an iOS version yet. iOS development is very expensive, very difficult and it is illegal unless you pay apple a lot of money for a specific kind of computer. I'm sorry!
The game is open source, so if you know somebody with a lot of money (or maybe someone who is already an iOS developer) then maybe they can port it!