The Creator and Ruler of the universe; the Supreme Being.
The creator :
The universe thus God was created spontaneously from nothing therefore God cannot consider himself as the creator only as that which was "created" ( the universe) which has the ability to create.
Ruler of the universe:
In your context I would say no. The universe is automatically self governing.
The supreme being:
Being meaning single self contained entity. If the universe is considered as self contained entity then it is in a state of being.
Supreme as in being supreme above all else in this universe then yes supreme as in the universe as entire is greater than a single part of the universe.
Superior with regards to human abilities I would say yes but superior as in humanity being inferior as a part of the universe I would say no.
A bit like looking at you hand and saying that your hand is inferior to it's owner..... a bit silly I think.
The hand may think that the owner of the hand is superior to it but the owner of the hand would not consider the hand in this way.
In a way I liken this relationship in human terms as an Autocratic democracy.
Not all unlike the relationship of the queen of England to the parliment of England. In that the queen has the power to intervene but chooses not to. By her Grace so to speak.
It is only in times of major crisis that she would use her supremeness and only to pursue a solution to the crisis.