Go to properties, Betas, then select "android - APK Version of the game" under beta participation. It'll download the apk which you can send to your mobile device.
I'm currently on Tate's route, and I'm loving this game. I already finished Aiden's route, and I like it, though very bizarre at the end.
I really like Tate. He's really cute, and such a troublemaker. (Also for some reason, I imagine he has an Australian or New Zealand accent. Don't know why)