Hey, kinda late reply but I finally found out about this contest and amazing submissions!
On the same note, I'm also stuck at level 4. I don't know why, but for me the 3d audio doesn't quite work. I somehow got past the long corridor, but I am stuck at the next section. I don't understand how to pass the first line on the floor. I tried every angle possible (through the center, left, right etc), up on the nearby ledges, when the sound was on and off, but I always die.
Is there something I didn't figure out? I'd so much love to play the next 2 senses...