Sure! Here's an example of a simple 2D platformer game implemented using JavaScript and HTML:
In this game, you control a blue square (represented by the `player` element) with arrow keys. The player can move left, right, and jump. The game area consists of green platforms (represented by the `platform` elements) that the player can stand on.
You can either open the HTML file in a web browser or copy the code into a text editor, save it with the `.html` extension, and open it in a web browser to play the game. Just use the arrow keys to control the player's movement.
Please note that this is a basic example and can be expanded upon to create a more complex and engaging 2D platformer game.