Sure! Here's an example of a simple Zombie Apocalypse game implemented in a single HTML file using JavaScript and enclosed in script tags:
This is a basic implementation of a Zombie Apocalypse game where the player (represented by a blue square) needs to avoid the zombies (represented by red squares) by moving around the screen. If the player gets too close to a zombie, the game ends and a "Game Over!" message is displayed.
You can play the game by opening the HTML file in a web browser, either on a smartphone or a desktop. The player can control the game by dragging their finger on a touchscreen device or by moving the mouse on a desktop computer.
Please note that this is just a simple example to get you started, and you can expand and customize the game to fit your desired gameplay and visual style.