Unfortunately, due to major bugs in the app, users running CyanogenMod on their android phones cannot run the app because it immediately crashes upon pressing the app’s icon. Luckily my girlfriend has a supported device, the iphone 6, and I was able to play around with the game. When it runs it’s quite fun and I can see it being a good way to get to know things about your friends that you don’t have time to ask yourself!
Sign up for your My Nintendo account at my.nintendo.com and join the game from miitomo.com.