Sure, here's a simple game that meets your requirements:
In this game, you'll see a red ball in the center of the screen. When you tap/click on the ball, your score will increase and a cute teddy bear image will appear momentarily. The score is displayed in the browser's title bar. You can replace the `emozi_all/game.png` image path with your own pictogram if you have one.
Save the code above in a file with a `.html` extension and open it in a web browser (preferably on a smartphone) to play the game.