I'd like to suggest an idea which is not an obvious one but could make the app more elegant and save considerable amount of user resources, including time and bandwidth. Why do you you include all the graphical resources for ALL SUPPORTED devices at the time of app installation, instead of downloading them at the moment when the particular device is added to the app? I understand that this may require additional work on your side, but could make an impression of well-thought app, instead of half-gigabyte-sized bloatware it now is.