Very nice entry.
It took me a while to grasp the full idea but when it clicked, it clicked hard. I really like your interpretation of the theme, this may be my favorite yet. The division of the palette between gold and grape is a stroke of genius.
It's a shame then, that so much of the game is spent aimlessly digging down but I understand that it's necessary to give your bottled gold time to get older, love how uncompromising you were with your initial vision. Despite that, I think that a more juicy mining minigame would have made the whole thing a lot easier to sink into.