itch.io

There is a app for the site but it probably won't help you with the game.

Edit/Continuation: Especially since the web browser/site will reset your save data.

But yeah if you're using Android download the APK file and install it.

Then surprise you have a app.

What do you mean by a legit app? If it's compiled into .apk, then it's a legit app you can download and install on your phone. It doesn't mean though it has to be published on some kind of Google Play market to be a "legit" app. 

And yes, GP won't allow to publish any sort of adult games, as far as i know.