Hey! I just so happen to have an Android as that's the phone type I've been using my whole life; that doesn't automatically mean that I'm a minor, I just prefer sitting in my bed playing than sitting at my PC. I feel as if thats a very harmful generalization and if you want to limit access to kids the best option would be for your game to cost money.
Is the main assumption here that people who play on their phones are more likely to be children? If so then how does that argument stand when you allow apple users to download? Not sure