This save has life it it, right? Because Love is a life element, so when it touches the edge of the screen why doesn't it appear at the opposite side like normal life? Just wondering.
Oh! Well, that's one mystery solved.
Technically it is very similar, when a pixel of love exists, it sets its grid position(9 pixel width) to 1, and every frame draws a heart on that grid position. GoL adds one to all the grid around it(1 pixel width), and new ones are drawn/killed based on the counts.