1.) If 75% or more of the blocks on the level are broken the level should be cleared but if 100% are broken a bonus for breaking all of them is added.
2.) Storyline.
3.) reducing the power of the extra balls but make them bounce off the paddle.
Penguin sliding might be fun addition. Snow man and polar bear obstacles. Goal is to try to get as far as possible without hitting the obstacles. get exp and money on a scale to how far you make it and of course upgrades with penguin slide points.