Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript and enclosed in script tags. The game is designed for smartphone operation and utilizes pictograms for the visuals.
In this example game, the player is represented by an image of a player and the enemy is represented by an image of an enemy. The player can move left or right using arrow keys, while the enemy moves downwards from the top of the screen. If the enemy reaches the bottom of the screen, the game is over.
Please note that this is a basic example to demonstrate the concept of a game. You can customize and enhance it according to your desired gameplay, graphics, and features.