Hi.
I think your analogy is really unique. Although the main idea is the good old "neither a key nor a lock can work alone", you make it fit your own personality by saying that the gregarious 'spinner' is always there to make his friend lol. To me this essay is also appropriate for the topic "describe an intellectually engaging activity", but you may want to make some amendments here and there.
...recarious positions, all look at me, attentively anticipating...
...me attentively, ...
I flick it
I thought spin will be better. It depends on your board size, though.
Gradually its momentum decreases. Slower and slower, passing the left hand quadrant
"Gradually its momentum decreases" alone will be enough.
laugh out loud and enjoy themselves
Either one of these will do
I think this essay is good.
G L~