Tried the 600 second run and had a bunch of fun! I kinda wish there were some fun movement/collection mechanics that would reward you for going far from the chest so you can explore the whole island. I was also fully expecting to play as an actual chest of gold, but I do like the mechanic of having to come back to the central chest. Great job!
Also, weird nitpick, but I don't think you need the "Worth" tags. I got enough feedback of how much gold I was picking up based on the size of the object in-game and by how much it moved my bar/increased my total treasure when I picked something up, and I picked up the items before having a chance to read the worth tags.