@Elle95z: It is now already on android app though not apple as it seems that is more complicated. I am sure that if they get permission to do the whole game they will similarly put it on devices as an app as well.
@btsfangirl: The demo is now on android app. As for doing the whole game free i think that is very unlikely. They are a business, and creating a game is not cheap. I doubt it could be free.
@jungkook_97: Again, the demo is free, but the whole game couldn't be free. You are asking a company to make and release a whole game of likely 30-40 hours for free. That is impossible. The sprites, the backgrounds, the game coding all of it costs money. And they have bills like everyone in order to survive and live. No doubt they will do their best to get it both on apple and android.