Google can dictate who has or retains access to their market, but that doesn't make them a monopoly, since other markets exist. This game is still available on Steam and probably elsewhere.
For android?
I don't know. Is it illegal or impossible to install android software any other way? If so, then the problem seems to be android and not Google.
And besides, other platforms exist, so it still isn't a monopoly. You don't have to play it on your phone.