This is a solid little puzzle platformer that is hampered by the fact that it is so dark and you can't actively control your main light source. There's a couple of ways you could approach that, adding more ambient light sources, increase the size of the soul's or the player's light, provide a way to control the soul and tell it where to go, or have the soul follow more closely to the player. That aside, it's a cute game and a solid concept. Good job!