Sure! Here's a sample game called "Pet Snake SIM-ulater" implemented as a single HTML file:
This HTML file creates a simple pet snake simulation game where you control a snake using arrow keys to eat randomly spawned food. The snake grows in length every time it eats food, and the game ends if the snake hits the boundaries or collides with itself. The game is displayed on a canvas element, and the snake and food are drawn using JavaScript's Canvas API.