Depending on how good you are at overcoming difficult challenges, Beacon can be a rather lengthy platformer that will take some time to beat. Shadows are lurking in every corner waiting for our protagonist to make a wrong move, but as luck would have it a beacon of light appears out of nowhere to help him illuminate the way forward.
The beacon will occasionally take a branching path that is out of your reach, and you would have to rely on the light from blue and red crystals just as often to progress. This Ludum Dare competition entry is for Windows only. (updated version with save feature)