Interesting game and concept. Liked the art and mood, including the nice music. However when it comes to gameplay the lack complexity is noticeable! I think you'd need at least a few other factors like personal preferences, as well as a soft fail state (like percentage of inbred-ness vs happiness of the couples). You could also play around with divorce rate, if you keep matching far removed people that don't like each other.
Nice take on the theme, also good job on making it a whole experience with menu and options.