This game is absolutely gorgeous. I really love the art.
I eventually figured out how to use a combination of ladders and magnetism to bring gems back up to sell, but that took several retries, because seemingly once you get lower down, you're kinda stuck down there.
I had a lot of fun digging up my coins though! Although at one point I was able to just keep spamming dig on a block that never disappeared but kept spitting out coins, so I think I either bugged it, or something crazy was going on that let me get basically infinite money, haha.
Great work!