Implementation of mouse-based player control

After covering keyboard controls, it's time to move on to the mouse. The goal is to simplify and streamline the player's movement as much as possible and make it as intuitive as possible.

For those unfamiliar with Ghost'n Brothers, *Jailed* will be a much more ambitious sequel with a very different art style. It's a puzzle game in which you control two characters who must help each other escape the world in which they've been trapped....