A two player game- one player (green) uses the mouse, the other (purple) the keyboard. If your bump into a wall, go back to the start! Race to reach the star!
Purple uses WASD to move. Green player must move the mouse over the sphere to start it moving. There are a lot of ways to make a maze game work in Scratch- most of the ones I've seen or built have been clunky in some way, either too complicated or had bugs or exploits that broke the game. I *think* I've hit a bit of a sweet spot with the coding here, though my maze definitely has some tight squeezes in it.