I just went through your whole game without knowing there was audio until I was about to post a comment. Going back, the audio wasn't audible until I put the volume up to 4 times what I normally have it at, and more than twice the most I ever put it at for anything else. If I wasn't wearing headphones, my laptop's speaker literally would not have been loud enough for me to hear it clearly even at the highest volume.
Aside from that, the invisible barriers are really annoying, and they get in the way even in spots where I was jumping up rather than falling down. There's also several moments where it's plainly obvious that there's a platform right below an invisible barrier.