I want to make a fantasy-themed endless runner game. Give me a game design document detailing the basic lore, enemies, mechanics, abilities, power-ups, skills, artstyle etc. for this game. I don't want a generic theme for the game. It should also have a gimmick that makes the game easy to learn but hard to master.
Fantasy Endless Runner Game Design Document

Basic Lore:
The game takes place in a mythical world filled with enchanted creatures and mysterious powers. The player takes on the role of a brave hero on a quest to escape a horde of dark creatures that are hot on their trail. With each run, the hero must use their skills and abilities to outwit and outmaneuver the enemy and make their way to safety.

Enemies:
The enemy in the game consists of various mythical creatures, such as goblins, trolls, zombies, and other such creatures of the dark arts. Each enemy will have its own unique abilities and attributes, making them a formidable challenge for the player to overcome.

Mechanics:
The game is an endless runner where the player must navigate through a never-ending world filled with obstacles and enemies. The player must jump, slide, dodge, and use their abilities to progress through the levels. The player will be rewarded for their progress with coins and gems, which can be used to purchase upgrades and power-ups.

Abilities:
The player will have a set of abilities at their disposal, including a powerful magic attack, a shield to deflect enemy attacks, and a dash to quickly navigate through tight spaces. These abilities will be upgradeable with the coins and gems collected throughout the game.

Power-Ups:
There will be various power-ups available for the player to collect, including a speed boost, extra lives, and invincibility. These power-ups will help the player progress through the game and overcome obstacles.

Skills:
The player will need to master a variety of skills to succeed in the game, including quick reflexes, precise timing, and strategic thinking. With each run, the player will have the opportunity to improve their skills and abilities, making them a more formidable opponent for the dark creatures they face.

Art Style:
The art style for the game will be a vibrant and colorful fantasy world, with a mix of 2D and 3D elements. The characters and enemies will be animated in a whimsical and exaggerated style, with bright colors and fluid movements.

Gimmick:
The gimmick of the game is a dynamic difficulty system, where the difficulty of the levels increases as the player progresses through the game. The system will constantly adjust to the player's skill level, making the game easy to learn but hard to master.

Conclusion:
This Fantasy Endless Runner Game promises to provide a thrilling and challenging experience for players of all skill levels. With its rich lore, exciting mechanics, and dynamic difficulty system, this game is sure to be a hit with fans of the genre.