About the thicker outlines and more contrast, what did you have in mind?
Any specific assets?
In general a bit more "cartoony"?
*Edit*
I thought about it and realized your totally right. The idea was from the beginning that it's a top down view on a table and the UI is basically plates or bowls on the table. But then the table should be a kind of wood -> dark and the plates can be bright.
Thanks :D