Hey mate just a few things I thought of.
1. When in dialogue, adding in a way to skip dialogue.
2. Music is bit repetitive, could loop a few more sound tracks.
3. It would be nice when you are down in the cave if it was darker and you have to search for the chest.
4. I am not sure if it was just me but when I would hit F on things it wouldn't work, I would have to click a couple of times etc. I could be getting controls wrong though.