The kind of effect you're talking about goes against material design... actually a lot of what is in the theme breaks the guidelines and their intent.
I'm disappointed that this project didn't start as a fork of bootstrap, then the changes applied. It really seems like a designer trying to make a money play off of other's efforts. I can't be certain that is the case, but that is definitely the feel I get, and even then it seems to be only halfway there with the shadows applied to elements they don't belong in.
I've tried to follow the style of the Bootswatch, in this way it's very easy for users to inject this theme in any Bootstrap website. I'm thinking about writing a separated project sharing the CSS and basing it on some grid system without Bootstrap dependencies, keeping the compatibility with Bootstrap.
I'm disappointed that this project didn't start as a fork of bootstrap, then the changes applied. It really seems like a designer trying to make a money play off of other's efforts. I can't be certain that is the case, but that is definitely the feel I get, and even then it seems to be only halfway there with the shadows applied to elements they don't belong in.