Sure! Here's an example of a simple game implemented as a single HTML file with JavaScript code. It creates a black background with particles flying everywhere, exploding into smaller ones of various colors, and slow falling dots that change colors. Please note that due to the limitations of text-based communication, I can only provide you with the code. You can copy and paste it into an HTML file to view and play the game. Keep in mind that this code may not work as expected on certain devices or browsers.
To play the game, simply open the HTML file in a web browser on your smartphone. Whenever you tap on the screen, particles will explode from that point with random colors and slowly fall down. Enjoy!