Sure! Here's a simplified implementation of a 2D side scrolling platformer game using JavaScript and HTML:
To play the game, you can open the HTML file in a web browser on your smartphone, or you can copy the code into an HTML file on your smartphone and open it locally. You can control the player's movement using the arrow buttons on the keyboard.
In this game, you control a red ball (player) and need to jump on the blue platforms. The player can move left and right using arrow buttons and jump by pressing the up arrow. The platforms are solid from the top and sides, but you can go through them if you collide from below. The game loops continuously, updating the player's position and checking for collisions.