Sure! Here's an example of a simple first-person shooter game where you play as a zombie. The game will be implemented as a single HTML file and will use JavaScript for the game logic. Please note that the game will have basic functionality and limited features due to the simplicity of the implementation.
The game window will appear on a smartphone-sized canvas (800x600) with a green square representing the player (zombie). You can control the zombie's movement by swiping or tapping on the screen, or by using the arrow keys if you're playing on a computer. The objective of the game or additional features can be implemented according to your preference.
Note: This game only focuses on the movement of the player character and does not include any shooting or enemy mechanics.