Sure! Here's an example of a simple dot sniper game implemented in a single HTML file using JavaScript:
Score: 0
To play the game, simply open the above code in a web browser (tested on Google Chrome). You will see a game container with a score display. Dots will start appearing at random positions within the game container, and your task is to click on the dots as fast as possible. Each dot clicked will increase your score by one. The game progressively becomes more difficult as dots appear more frequently.