Atom-Sass is based on sass Ruby gem. Most of this work is based on GomatoX's sass-compile project. Huge thanks to him for coming up with the initial project.
To install this dependency, execute
gem install sass
Use atom package manager to install atom-sass.
apm install atom-sass
Alt + Ctrl + cto watch the files for changes.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.