Sure! Here's a simple game called "Run Sheep Run" implemented as a single HTML file.
Run Sheep Run
This game allows you to control a sheep using the left and right arrow keys on a smartphone. The objective is to avoid the sheepdog, cow, and horse represented by pictograms. The sheep can move left and right within the game area. When the sheep reaches the edge, it cannot move further in that direction.
Please note that the game logic provided here is very basic and doesn't include any interaction or collision with other characters. You can enhance the game by adding additional logic and features as per your requirements.