Sure! Here's a simple implementation of a 2D side-scrolling platformer game with the required features using HTML and JavaScript:
This code creates a canvas element where the game is rendered. The player (red square) can move left and right using the arrow keys, and jump using the up arrow key. The platforms (blue rectangles) act as solid surfaces which the player can stand on or collide with.
Note: This is a basic example and might not include advanced game features like scoring, multiple levels, or enemy interactions. Feel free to customize and expand it according to your needs.