The use of palm-trees and waterfalls over ragged cliffs is inspired by Super Mario All-Stars. The use of long tangling thorns is inspired by Donkey Kong Country 2.
Not shown in this picture: the first mailbox already has its flag raised, so bringing the firewheel powerup from a previous level lets one burn the thorns, jump down, and warp to the end of the level.
If the lemon powerup was brought instead, the Li'l Suns that are proliferate in the top path can be changed into coins.
Screenshots of this level in-game: