No
A 'beating heart' is not a metaphor, but is rather personification.
metaphor
probably not, it appears to be a metaphor and template of society and its corruption.
The metaphor at the heart of Orwell's allegorical tale "Animal Farm" is the Russian Revolution and the rise of Stalinism. The animals on the farm represent different groups and figures in Russian history, such as the pigs representing the communist leadership and the working animals representing the proletariat. Through this allegory, Orwell critiques the corruption and tyranny that can result from revolutions.
cold heart
Simile
an evil heart.
metaphor just because
your heart is a black hole. your heart is the the sun.
Yes, "heart of gold" is a metaphor that describes someone as kind, generous, and caring. It symbolizes someone who has a warm and loving nature.
is this phrase my heart is heavy a metaphor
He's exaggerating (and using a metaphor), but you could reply,"But my heart is warm" (literal)"But my heart's on fire!" (metaphor)"But my heart is like a furnace!" (simile)