This game was really awesome. Not only I am a big fan of the pixilated "shader simulator", but also love the level design. The hint provided by the (#%&()#&@%@#& on the 2#)&@%*328974156 really got me, and I would love to see more of those great ideas on level design.
The light switch mechanic adds to the horror of the game. Making me tide up and brace for a jump scare. The note in darkness pops up is pretty obvious, I believe there is no need for notes.
I do want to see more connection between those characters, or the character's connection to the level. A good complete storyline will make the psychological horror rise to another level!
Also, I can move between inside the walls on the second floor.