Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript. This game can be played on a smartphone by using the provided arrow buttons.
Spike Game
In this game, the player starts at the left edge of the game container and must avoid the spikes to win. If the player touches any spike, a message will be shown indicating that the player has won. However, if the player reaches the apple located at the right edge of the game container, a message will be shown indicating that the player has lost.
The game can be played by using the arrow keys on the smartphone's virtual keyboard. When the player presses the left or right arrow key, the `movePlayer` function is called, which updates the player's position and checks for collisions.
The game is enclosed within `
` tags and can be copied into a single HTML file for easy execution.