So the game runs on landscape on Android which is understandable - portrait would be more comfortable for fapping but I get that the UI might be tough to display. However, for some reason, the game will only use landscape on one side, for lack of a better description. i.e. it displays so that the home button on my phone is to the right of the screen. However, if I flip my phone 180 degrees, the display will not also rotate, and I am instead looking at it upside down. Is there any known fix for this?

To allow apps to rotate the screen according to the orientation of your device, or stop them from rotating if you find them turning around while you lie in bed with your phone, go to Settings > Accessibility and turn on Auto-rotate screen. This is on by default on most phones UPSers.