Thank you for your feedback !
We totally agree that a third of the screen is not useful in these levels ^^'. In fact, originally, we intended to have 3 more levels where the character's reflection was not visible, so you would have to look at the reflection to know the layout of the level, but then focus on the "real" world to navigate. Unfortunally, we didn't have time to create those levels ^^'.
For the shadows, congratulations if you've found some cheese =D. We didn't have time to organize a playtest with external players (that damn time limitation =p !), that's something we will prioritize for the next jam, thank you =).