Not sure if anyone's active enough to see posts here anymore, but I've been playing Uurnog recently and loving it, but I've found something I can't make sense of.

There's a room inside the E zone that has a blocked up doorway that seemingly has no purpose, and yet it looks awfully suspicious.
I've tried everything I could think of, using the blue and red orbs (which on a side note I still haven't found any use for), using a bomb, exploding a heart with the heal gun, using the gold key.
Is there a way to open it, or is it just taunting scenery?