For your fantasy-themed endless runner game, the game design document should include the following:

Lore:

    A vibrant and immersive fantasy world, with an engaging story that players can discover as they progress.
    Unique characters, creatures, and environments that help set the tone and theme of the game.

Enemies:

    A range of enemies of varying difficulty levels and abilities to challenge players and provide a sense of progression.
    Optional boss fights and mini-bosses to provide extra challenge and a sense of accomplishment.

Mechanics:

    Smooth and responsive controls, with a variety of power-ups and abilities that help players survive and progress through the game.
    A “risk-reward” system that encourages players to take risks to gain rewards, such as extra points and power-ups.

Abilities:

    A range of abilities that allow players to interact with the environment, such as wall-jumping and double-jumping.
    Special abilities unique to each character, such as a magic shield or fireballs.

Power-ups:

    Consumable items that can be collected to increase players' abilities and scores.
    Permanent upgrades that can be earned by completing specific objectives or challenges.

Skills:

    Unique skills that can be upgraded and improved over time to give players an edge in the game.
    Special abilities that allow players to access secret areas or interact with the environment in unique ways.

Art Style:

    A distinct art style that helps to set the tone of the game and make it stand out from other endless runner games.
    Bright and vibrant colors that help to create a vivid world.

Gimmick:

    A unique and engaging mechanic that makes the game easy to learn but hard to master. This could be a new power-up system, a unique control scheme, or something else entirely.
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