Its a nice mechanic and interesting puzzle. my initial thought was that shadows would play more of a role like be solid and where it is lit it is air and you have to guide the potion that way. GJ!
That was my first intention of the game, to have the shadows affect the object directly, but then I ran in to too much performance issues so I had to pivot into this where the shadows are a reason to move your character because of visibility of the level.
