Sure, here's an example of a simple Minecraft-style platformer game implemented as a single HTML file using JavaScript:
In this example, the game consists of a simple platform represented by a colored background in the game div. The player character is a green square at the bottom of the platform. The player can jump by tapping on the game area.
When the game area is tapped, the jump function is called. The jump function animates the player's movement in an upward motion until it reaches a certain height. The game loop continuously checks the game width and player's position to change the background color based on whether the player is in the air or on the platform.
Please note that this is a basic implementation and can be expanded upon to create a full-fledged Minecraft-style platformer game.