Sure! Here's a sample implementation of the game you described, written in a single HTML file using JavaScript and enclosed in script tags:
Sheep Run Game
In this game, the player controls a sheep using arrow keys on a smartphone device. The objective is to find 13 grass represented by paddock pictograms. The player starts at the leftmost position and can move right or left to land on the grass paddocks. Each time the player lands on a grass paddock, the grass-found counter increases. Once the player finds all 13 grass, the sheepdog pictogram will transform into a cow and a horse, indicating that they will protect the sheep. A congratulations message will be shown, and the game will end. However, if the player lands on the rightmost position where the sheepdog is, they will get caught by the dog, resulting in a game over message.