I really like the fog mechanic and appreciate the effort you put into finding a creative interpretation of the theme (which is more than I can say for myself). I kinda wish the game focused more on the fog mechanic, since it's something I haven't seen any top-down adventure game do before.
Also, the asset you used for the fog looks like a noise shader, I don't know much about unity's shader system (godot dev here), but there's got to be a way to have it move and overlap with other shaders which would make the effect look really cool.