Even sound is important in this game!
I used double jump to explore lots of stuff and found something at the top of an area. I swear, I was ready to never come there again because there is nothing to explore. I'm playing in a library of my university right now, cuz why not. So my sound is almost 0. And I was ready to leave and then I heard a damn whisper. like wtf. I go back and punch everything and a wall breaks, i find one of those weird sisters.
I would have missed this for ever. I will never play this without sound again.