It runs fine on a rooted Marshmallow device... I know, because I just installed it and it is running fine

What it does do, is pop up a big scary warning saying that "the device security is compromised because it is rooted and any app can access any other app's keystore data and steal your bitcoins"... which is technically true, but only if an app has been granted root permissions... so like with most security things, you need to be smart and sensible about what you're doing with your device...