The colors are great, but as I'm sure you've seen, they're exceptionally similar to some other interest checks being run right now. Still, I love dark sets, so I think you have something good on your hands here. I don't know how this will work out, but maybe try adding some deep purple like you might find on an azurite crystal or light green for malachite. There's potential for some interesting novelties, too. This is going to turn into something really cool!