Sure, I can create a simple cyberpunk-themed platformer game using JavaScript within a single HTML file. Here's an example implementation:
In this game, you control a player character represented as a white square. Use the arrow keys to move the character left, right, and jump.
The goal is to navigate the platforms represented by red rectangles and reach the top. The character will stick to the platforms and can only jump if on the ground or on top of a platform.
Please note that this implementation is a very simple example and can be further expanded upon for a full-fledged game.