Heyas^^ its me again. Since i cant decide wether to write in bad english oder even worse german ill do first Id like to see a kind of Animalsystem. But pls not as bad as in minecraft Maybe you could implement a system where you can actively change the type of animal. Like you tame a brown male and a black-white female cow. Beside the fact that both of them will have plenty of fun, soon a cattle is born. This cattle will have various percentage of the father genes and the mothers. Like, the "race" of the father gives plenty of milk, therefor the meat has baaaad quality. Therefor the mother has middleammount of milk but they are fat and give plenty of meat. Now you as farmer can decide what kind of cows you need and want to breed. Same can be done for other animals. Like sheeps gives different kind of quality wool, maybe therefore the better wool it is harder to spin.
Just an idea