Sure! Here's a simple HTML file that implements a game with an obstacle course (obby) and a time limit selected by the user:
To run the game:
1. Copy the code above and save it in a file with a .html extension (e.g., game.html).
2. Open the file in a web browser, preferably on a smartphone.
3. The game will prompt you to enter a time limit (in seconds). Enter your desired time limit.
4. The game will start, and you can use the left and right arrow keys on the smartphone keyboard to move the player (represented as a blue circle) to avoid the moving obstacle (represented as a red circle).
5. If you collide with the obstacle, the game will end, and it will display the time elapsed.
6. If you exceed the time limit without completing the obstacle course, the game will end, and it will notify you that time's up.
Note: This is a basic implementation of the game using JavaScript and HTML canvas. You can customize and enhance it further according to your preferences and requirements.