Sure! Here's a simple game called "The Floor is Lava" implemented as a single HTML file with JavaScript:
The Floor is Lava
Try to stay on the platforms and avoid touching the lava!
In this game, the player needs to stay on the randomly generated platforms and avoid touching the lava represented by the red background. The player can control their position by dragging their finger on the game board. If the player touches the lava or moves outside the game board, the game ends and a game over message is displayed. After the game ends, the platforms are regenerated and the player is reset to the starting position.
Please note that this is a basic implementation of the game, and you can add more features, levels, and complexity based on your requirements.