Whenever I am in the Home screen I am a lot shorter than when in the game. Also when I reach for the floor with my lamp or knife I cannot touch the floor because it's too far down. I think my feet are about 30cm above the floor. Personally my length is 1.72 if that helps.
I would expect floor to be on the same height as the Guardian. So length of person should be same in the home screen as in the game.