Thank you so much for trying this prototype! I understand your comment BUT skin colour is not the only thing! There's also height. Of course, that's not much but this was done for a game jam me. As I didn't have a lot of time I thought skin colour and height were the most visible and simple features.
Hopefully I'll be able to add some more things in the future, but right now I do not have any ideas about how to make a game out of the concept of making perfect humans.