Moon levels

Successfully complete the first sixteen levels to unlock the jump pad to access the moon levels.
Play as Grannie

Collect 2,000 Diamonds and 40 Water Sprites. Then at the title screen, press L to switch to Grannie, who has all available power-ups.
Bonus power-ups

Collect the indicated number of Golden Diamonds to unlock the corresponding power-up:

Extended Hover: 1,200 Golden Diamonds
Power-Shot: 800 Golden Diamonds
Vertical Boost: 1,600 Go