This is an example of Darwinian evolution. the high size score shows the size of the largest creature recorded on that play. Low size score is the opposite. The color of the screen is the same color as the eyes of the type of creature that is unable to reproduce. The size hazard is telling which size of creature is unable to reproduce. Press 1 2 or 3 to only see different types of creatures.
To me. To Charles Darwin for the theory!