Game - 100 Balls

I've had a go at writing my first ever game for an assessment as part of a Creative Programming course I'm taking on Coursera. Please give it a try. I've only really tested it in the Chrome browser. I suspect the sound won't work if you're using anything else.

Instructions:

• Fill up the screen with balls! Fill to the target to move up a level.
• Click and hold the mouse button to start adding a ball to the screen.
• Release the mouse button to add the ball.
• Avoid the red spiky things when adding a ball - they will pop it!
• Once a ball is added it cannot be popped.