Okay, let's start building a simplified version of the game QIX using HTML Canvas and JavaScript. This initial version will focus on the player movement, drawing lines (Stix), and a basic Qix entity. Area filling and Sparx enemies will come later.

This sets up the basic HTML structure, styles the canvas, and includes the initial JavaScript for:

1. Canvas Setup: Creates the drawing surface.
2. Game Objects: Defines player and qix objects with basic properties (position, speed, color).
3. Drawing: Functions to draw the border, player marker, the Qix (as connected lines), and the Stix being drawn.
4. Player Movement: Handles keyboard input (arrow keys) to move the player. It restricts movement to the border initially.
5. Stix Drawing: Detects when the player leaves the border to start drawing and when they return to finish (though area filling isn't implemented yet). It stores the path points.
6. Qix Movement: Implements simple Qix behavior where its points move towards random target locations.
7. Basic Collision: Includes rudimentary checks for the player marker hitting the Qix lines, and the Stix hitting the Qix lines while drawing.
8. Game Loop: Uses requestAnimationFrame for continuous updates and rendering.
9. Game Over: A simple game over state triggered by collisions.

You can run this now. Use the arrow keys to move the marker along the border. Move off the border to start drawing a red line (Stix). Return to the border to complete the line (it will disappear for now). Avoid touching the green Qix lines with your marker or your drawing Stix.