The Eternally Grey is a free game where you must defend the gems from the miner menace.
With a great atmosphere and emotional touches with providing the cavern's perspective on the 'children' being stolen. It is fun time playing this game. It has good music and your take on the Cavern theme.
You can enjoy seeing how even with that premise we both explored very different aspects of that concept. Like the area of effect of the big stalactites.