I have to take a look how you created the game! I didn't quite get the rating, is it just displaying how many balls I keep in the air at the time? I don't like to move the character to throw the balls again. Would be nice if one could have a mouse button press event to give an angle and amplitude to the thrown ball.
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The bar increases faster depending on the number of juggling props in action, the goal of the game is to fill the bar, I did not tweak the score mechanic enough to get a more intuitive feel. I like your idea of an angle selector, maybe for a special move or a more difficult mode, since I would have to reduce the current gravity value.
The source should be in in the download page.