Sure! Here's a simple Parkour game implemented as a single HTML file using JavaScript:
This game is a simple parkour game where the player, represented by a white rectangle, needs to avoid the red obstacles falling from the top of the screen. The player can move left and right using the arrow keys. If the player collides with an obstacle, a "Game Over!" message will be displayed.
Please note that this is a basic implementation and can be further enhanced with additional features, levels, scoring, and graphical improvements.