I sadly can't get through the first chamber :(
I throwed, pushed and glitched the cube through the window. I even throuwed it through the door, but the game doesn't say i did it :(
But that what i have seen was good. Here a little thing that i noiticed: When you look behind you in the hallway before the fisrst chamber you can't see anything. I shouldn't took to long to place a usless door behind the player so that it doesn't look's like he came from the chamber.