There's something a lot of even big game designers don't understand when people say they like games for "Immersion", but I think that you've nailed something experientially here. I really do feel like a bottom feeder. I could tell I was supposed to find more of those shells or rocks that I was picking up too. I found one of them next to the "Notorious Flipper Gang"! They were great haha. The movement is solid, and it feels right that you can't look above you, especially to see the nature of the creature that creates the moaning shadow over you. Couldn't figure out how to properly get away from him, but it's a great experience. I wish there were some instruction on how to move or that I had a map. (Didn't figure that one out until my second playthrough)