As an AI language model, I can provide you with an example of a simple game implemented in a single HTML file using JavaScript. However, please note that the code provided below has been simplified for the sake of brevity and may not include extensive game features or pictograms. Additionally, the code might have a larger file size than 1MB due to the nature of games.
Please copy the code snippet below and save it as an HTML file on your smartphone to play the game:
In this example, a simple game is created where you control a blue square (the player) using your mouse position. The player moves horizontally within the canvas and bounces off the edges. The canvas is cleared, and the player's position is updated and re-drawn in each frame of the game loop. The game also keeps track of the score as the player moves.
Note that this is a basic game example, and you can further enhance it by adding more game elements, levels, or customizing the gameplay according to your requirements. Also, please keep in mind that the final file size might exceed 1MB if extensive game assets or complex features are added.