Thanks for the feedback! We've added and tweaked a lot in the next patch - there is also a bug where your last movement on the horizontal and vertical axis keeps depleting even if you released the key, so that's a big part of it. There are also a lot more healing pickups around the level, and more clarity in what they do. A lot to look forward to in terms of quality of life and gameplay tweaks!
I'm personally responsible for the audio part, and the brunt of the sound recording part is vocal/mouth sounds! Sounds like the bone rattles are some wooden pencils being picked up, and I've also got some experience making tracks for my games. As for the FOV, it should be the default 90 degrees angle you see everywhere. I'll try to remember to include an FOV slider in the settings!