Hmm why shame? There is a lot of things You can add like caves, lakes etc.
I think this is quite easy to do. I have spent a lot of time adding UE4 visual effects instead.
I can implement this and also add the caves and the cieties etc.
I want to make basic toolkit for everyone so for about 30-60$ You can buy 1 month of my work and expand this making any game You want to and adding whatever You want. If You have some wishlist You can just let me know.