Thank you for playing!
We thought about adding some info about the mechanics a bit too late, and didn't have enough time to do so.
As for the shadows, the characters are separated by a mirror (left is trapped inside the mirror, right has to guide them to the door), and so whoever's on the left can't see behind the objects because they create a shadow in the mirror (if that makes any sense). And if the left person can't see in the shadows, whatever is there isn't actually there if you know what I mean.
Sorry if it's a bit confusing, it was a bit hard trying to explain what we thought of, lol :')
Also thank you for the idea of switching between which character to control, I think it'd be nice to add something like that in the future!!