The Great Tree (Not on the current agenda)

Just so you know, The Great Tree is actually a hub world:

The first Eternity Stone was collected. The Forest Leech reverted back into a regular Forest Feeder. After the Feeder died off, the twins couldn’t help but feel a powerful yearning to burrow deeper into the forest…

[The player is brought to the hub world, where he/she is capable of selecting any world that has NOT been completed]

The hub world map will include 10 worlds; most of them will contain 3 stages to explore. At the end of every 3rd act, the twins will confront a boss that they will have to fight.
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(In the event that the player accomplishes the goal of completing every world, they will unlock Free Play.)

During Free Play, the characters chosen will or can have the ability to have side quests. Mainly containing challenges that work with low health, searching missions, or time attack missions.

(When every challenge is completed, the players will gain access to a hidden area in the Great Tree itself. See the Power-up items topic for more information: https://forest-walkers.forumotion.com/t21-power-up-items-not-on-the-current-agenda)
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<When a world has been selected after the game has been beaten; a sub-hub world will be available to the player. That way they could choose a specific level, rather than play the zone as a whole.>
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Trope used: Forest theme
Mood and setting: Jungle-esque, until 3 of the 4 Eternity stones are found.
Mood and setting part 2: Dynamic, suspenseful
Gimmicks used: Besides bias worldly hubs, nothing else is to be intended.