Sure! Here's an example of a simple shooting game implemented as a single HTML file using JavaScript. As per your request, it is enclosed in `` tags.
<br><br>
<br>
<style>
canvas {
border: 1px solid black;
}
</style>
<canvas id="gameCanvas" width="400" height="400"></canvas>
This code creates a simple shooting game where the player controls a blue square using mouse movements and shoots bullets by pressing the spacebar. The objective is to shoot the green enemy squares to earn points, while avoiding getting hit by them. The score is displayed on the top left corner of the canvas. When the player is hit, a "Game Over" message is shown.