If you can collect 201 jawbreakers in a level, you get an extra heart on your health meter. The max amount of hearts you can have is 8.
If you can't seem to find one of the rabbits, press "R" on your keyboard and it will bring up a radar showing where all the rabbits are.
If you seem to be stuck, and just can't get past this level, no matter where you are, click the mouse and hold it down, and press N. It will get you into the next level. any score etc that you had is added like normal.
At the title screen, left click and hold, press the given button, and start a new game: