Bought paid one week ago and its really good. Hats off to your work on this substratum theme. I am on OnePlus since OnePlus 5 and at present i have OnePlus 6t.
I was waiting for this for long and you made it. Its really good man.
One suggestion- Please include transparent and semi-transparent backgrounds also if possible. Or it will be more cool when different level of transparent backgrounds options added.