Sure! Here's a sample implementation of a fast-paced platform game using JavaScript within a single HTML file. The game can be played on a smartphone, and it uses pictograms to represent the characters and obstacles.
This HTML file contains a canvas element that serves as the game screen. The JavaScript code initializes the game, updates the game at a rate of 30 frames per second, handles the player movement, and draws the game elements (player and score) on the canvas.
The player can control the character's movement by tapping/clicking on the canvas, causing the character to jump upwards. The game ends if the character falls outside the canvas. The player's score increases over time, and it's displayed on the screen.
Please note that this implementation is a basic example to get you started with a simple platform game. You can customize and improve it further based on your requirements and game design preferences.