I've evolved my GUI design to what's shown below. This screen will animate as the main menu when the side button is pressed. When the watch is tilted to view, it'll show your preselected watch face, but if at any time you press the side button in, it'll go to this menu with your wallpaper and give you information about the temperature, if you have notifications, your battery and bluetooth state, and things like that. You can then scroll up or down to read notifications or see sensor data!