Sure! Here's an example of a simple platformer game implemented as a single HTML file using JavaScript. It is designed to be played on a smartphone and uses pictograms.
This game features a simple platformer where the player's character can jump on different platforms represented by colored rectangles. The player can jump by tapping (on a smartphone) or clicking (on a desktop) on the game canvas. The game loop continuously updates the game logic (player movement and collision detection) and renders the game elements on the canvas.
Note: This is just a basic example to get you started with a platformer game. It can be expanded and enhanced further based on your requirements and preferences.