Sure! Here's an example of a platformer game implemented as a single HTML file using JavaScript and enclosed in script tags. The game assumes smartphone operation and uses pictograms where possible:
This code sets up a simple platformer game where the character can jump, move left and right using the d-pad buttons, and attack using the sword button. The camera follows the character by changing the character's position within the game container. Enemies are represented by blue rectangles, and when the character collides with an enemy, the enemy disappears.
Feel free to modify and enhance the game as per your specific requirements and preferences. Good luck with your game development!