Finally I can hear something..

Added the background music and the SE on the balls and the void (aka pink line)

Some audio does add a little POWER to the game right ???

BTW Should I add a hoop to the biggest ball in the game ?

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Credits to Kenney.nl for the SE on the balls collision.

Credits to XtremeFreddy for the game music on pixabay.com

And also Soundflakes swoosh sound from freesound.org.