Sure, here's an example of a simple game implemented as a single HTML file using JavaScript:
Optical Illusion Game
Score: 0
In this game, there is a single image displayed as a pictogram. Every time the user taps or clicks on the image, their score increases by 1. The image displayed on the screen changes randomly after each tap or click, creating the illusion of a game. The score is updated on the screen accordingly.
Please note that for the game logic to work, you need to provide and replace the 'emozi_all/game.png', 'emozi_apple.png', and 'emozi_bear.png' with actual pictogram images of your choice.