There's an APK file you're supposed to download. You run that file and it will install the game. then you open it like any other app. There shouldn't be anything to extract. Did you download the windows version by accident?
I pressed the one with the Android icon and it gave me a zip file, if that's not supposed to happen I wouldn't be surprised. I've been getting some insane amounts of "not supposed to happen" bugs and shit related to technology
