This is so dark, I love it ๐๐ Does eating the organs do something? I thought it might restore health but it didn't. Upgrading is just placing them in the doll right?
if you have a heart your blood stat is increased to a max of 10, every organ uses a fixed amount of blood if your max blood is higher than the used blood the organs work.
the lung for example buffs your movement speed and the muskle your damage