Sure! Here is a simple game implemented as a single HTML file using JavaScript. It features a blue emoji (representing the player) and red emojis (enemies). The objective is for the player to move left and right to collide with the red emojis and eliminate them. The game ends if any red emoji touches the player.
To play the game, you can copy and paste the above code into a new HTML file, save it with a .html extension, and then open it in a web browser on your smartphone. The blue emoji (player) can be moved left and right using the arrow keys on your smartphone's keyboard, directing it to collide with the red emojis (enemies) to eliminate them. If any red emoji touches the blue emoji, the game ends and an alert message appears saying "Game Over!"