Firstly, to run the project, you must be using "turbo mode". This is easily done by holding the shift button while clicking the green flag. If this is not done, the project will not run. This is because the project uses raycasting. In essence, raycasting is like ultrasound. It uses a sprite to map what it sees and another sprite to render the map. This must be done quite quickly, which is why turbo mode is used. Use the arrow keys to move around. Please disregard the lag, I am not familiar with the advanced methods of raycasting which contribute to eliminating it. There are three levels and the point is to leave the maze before it gets dark. To leave, you must touch the edge of the stage. Have fun!
Thanks a ton to the ScratchWiki article about raycasting, from where I took most of the mechanics. However, for my uses, I simplified them, to avoid confusion.