On Planet Bunnera You Have To Jump and Air-Jump and Glide a lot to pass from one cliff to the next. Dashing and jumping makes you go higher and faster.
Dash: Hold down Y and the Left or Right button
Dash and Jump: Dash and then use the B button to jump.
Jump: B button and Up button
Glide: B button and Left or Right button while in the air.
DO NOT use Star Spin or Shooting Star Attack; these will make you fall straight down and lose a heart.