bad
CLICK THE BALLS USING YOUR MOUSE. EACH COLOURED BALL SCORES 1 POINT, BUT BLACK BALLS TAKES AWAY 1 POINT. YOU HAVE 10 SECONDS TO SCORE AS MUCH POINTS AS YOU CAN.
bad
jay 136 clicks lag live tab and enter butons
summary is not needed
You've got pluralization errors. And there is no funny message for getting a negative number of balls.