Move the mouse to move the light source. This runs okay on Scratch if you have a nice computer, but TurboWarp is recommended anyway: https://turbowarp.org/718406314/?hqpen It would be fun to make a maze game with this.
Reflections are next on the to-do. August 1, 2022: - Several graphics modes - Shadows now get softer the farther they are from the light - No more Moiré effect!