Some suggestions:
1-) Make an option to revert to old ball sounds, fart like sounds are not funny after a while.
2-) Make the starting level equals to ball power multiplier and starting money equal to CASH_BUNUS_COMPLETION times{SUM(1 to STARTING_LEVEL)}
3-) Pink ball effect isn't worth, change the pink gradient to a simple circle with a lower opacity like Radioactive ball
4-) Random pop up Power ups should be on top of all, if it should be hard to click it, then we only need to turn the effects off and it becomes very easy.
5-)Power Ups should have upgrades as well, they lose all meaning after 32x power ball upgrade. We should be able to upgrades its power/effectiveness and time for each of then.
6-) More bricks patterns.
7-) Another Ball type: Like a Critical Ball, that has a chance to destroy any brick in a single hit (even black ones)