Sure! Here's a simple example of a 2D game implemented in a single HTML file. It includes player controls for movement (WASD), jumping, shooting guns, picking up loot, enemy spawning, and bosses.
Please note that this is a basic implementation to give you an idea of how you can structure a game. You can enhance and customize it further based on your preferences and requirements.
This HTML file sets up a canvas element where the game is displayed. It defines player, bullet, and enemy objects with their respective properties and behaviors. The game initialization function initializes the game elements, spawns enemies, and sets up the game loop. Controls are provided through keyboard events. The game over function triggers when the player collides with an enemy, alerting the score and reloading the page to restart the game.
Keep in mind that you can further enhance the game by adding more features, levels, graphics, and animations based on your requirements.