About 40 or so minutes in: it was after the three buttons you have to stand on, then a couple of other areas... I believe it was right after the part where light recedes into a wire sculpture to reveal a hole in the center of its floor that you jump down to continue. Shortly thereafter were some stairs; as I was going down them I guess I went a little too far to the left and fell in a hole on the side that I am unable to jump out of. Screenshot attached. It seems I have no means to continue, which is unfortunate as I was apparently a fair bit of the way through it given its estimated time?

Note: I can jump up and down, but I can't move forward to get back onto the stairs. Also, I tried looking down and there was some other space underneath the stairs, but I couldn't get to that either.