The #Pixelfed app is now in the Google Play store. It is installable and the only issue I had was that navigating away from the login page to get my password reset the login process and I had to start over. It is very snappy to use, and it is more responsive than #Pixelix which I currently have installed on a backup phone. There don't seem to be any theme options that I could find, so you'll be stuck with basic white.