Sure! Here's an example of a simple zombie game implemented as a single HTML file with JavaScript. Please note that this is a basic implementation and can be further enhanced with additional features and improvements:
Game Over!
In this game, you control a blue square (player) using touch gestures on a smartphone. The objective is to avoid colliding with the green squares (zombies). If the player and zombie collide, the game will end, and a "Game Over!" message will be displayed.
Please note that this is a basic implementation, and you can add more features such as scoring, levels, additional controls, etc., to make the game more interesting and challenging.