Sure, I can help you create a simple game about shooting zombies using HTML and JavaScript. Here's an example implementation:
This implementation demonstrates a simple game where the player controls a character (green rectangle) using left and right arrow keys. The objective is to avoid colliding with zombies (red rectangles) that continuously spawn from the top and descend downwards. The game ends when the player collides with a zombie, and the score is displayed on the canvas.
You can copy and paste the above code into a single HTML file and open it in a web browser to play the game. Feel free to modify and enhance the game according to your preferences.