The concept:

Hit bricks.
Somes bricks make grow flowers with sometimes bonus.
Catch bonus to add it in bonus list on the top.
Catch spores to raise the bonus power, each bonus has 3 power level.
Power level is represented by flowers on the racket. 3 flowers growing. When
the power 1 is available flower 1 launch particles, power 2= flower 2 and power 3 flower 3.
For example:
you catch multi ball bonus and laser bonus.
Multi ball is the active bonus and when used, laser bonus will take its place.
When multi in active, catch spores to raise the power level, at level 1 you gain 1 extra ball, level 2= 3 extra balls level 3 = 6 extra balls.

You'r right for the menu, I have to find homogeneity for graphical look.