Sure! Here's a simple example of a survival shooter game implemented as a single HTML file using JavaScript:
In this game, you control a blue player character by swiping up and down on the smartphone screen. The aim is to avoid colliding with the red enemy characters that try to move towards the player. If a collision occurs, the game ends and a "Game Over!" message is displayed.
Please note that this is a basic example and can be further expanded and improved upon.