Sure! Here's a basic implementation of a fantasy game with points, enemies, and an apocalyptic world theme, all contained in a single HTML file. The game will be playable on a smartphone, and I'll use pictograms to represent the elements. Please note that this is a simple example and can be expanded upon to include more features and complexity.
This is a very basic example of a fantasy game using pictograms for player and enemy representation. The player (🧙) can be moved using arrow keys on a smartphone, and the enemy (👾) will chase the player. When the player collides with the enemy, the score decreases by 10 and the game restarts. The score is displayed at the top left corner of the canvas. The game loop updates the game state every 100 milliseconds.
You can expand on this code by adding more features, levels, power-ups, and graphics as per your requirements.