Really fun idea! At first I was confused why I could not open the gold chests but then I read your description about how the game works. The inventory size was quite limiting but I suppose that is part of the challenge. I also think that the scrolling goes the wrong way through the hotbar if that makes sense? I think usually if you scroll down then your selection goes to the right and for you it was the other way around, it would probably help to stick to "norms" like that.
Other than that a nice and fun little game, good job!