Sure! Here's an example of a simple game implemented as a single HTML file, using JavaScript and pictograms. The player controls a yellow character using a virtual joystick and must shoot zombies before they reach him. The player can take two shots from the zombies before dying, and can shoot using the "L" button. There's also a shop where the player can enter if they have a scorecard, which they obtain by killing zombies. The game is never-ending, with more updates as the player progresses.
Please note that this is a basic example and can be expanded further with additional features and graphics.
Score: 0
Shop
Use scorecard to buy items
In this game, zombies spawn every 2 seconds and move downwards towards the player character. If a zombie reaches the player character, it's game over. The player can shoot zombies by clicking on the "L" button, and they have a maximum of two shots. The player's score increases for every zombie killed, and they can enter the shop if they have a score of more than 0.
Feel free to customize and enhance the game further based on your needs and requirements.