Sure, here's an example of a simple game called "Hedgehog Dash Run" implemented as a single HTML file using JavaScript. The game involves controlling a hedgehog as it slides through 18 levels. This version is optimized for smartphone operation and uses pictograms for a fun visual experience.
Game Over
To play the game, simply copy the provided code into an HTML file, save it, and open it in a web browser on your smartphone. The game will start automatically, and you can control the hedgehog's movement using the left and right arrow keys. The objective is to slide the hedgehog without hitting the ground. If the hedgehog reaches the ground, the game will end, and a "Game Over" message will be displayed.
Note: This is a very basic example to illustrate the concept of a game. Additional features like levels, obstacles, and scoring can be incorporated as desired.