Thanks for your answer
Antergos is an ArchLinux-based distribution, with some preconfigured stuff and desktop environment. From there, there is AUR which is a community repository of ArchLinux, and there is a package to install superpowers. ( https://aur.archlinux.org/packages/superpowers/ )
I tried too to build from the Git repository, with the help of the documentation "Building Superpowers", and after that if I create a project named "Toto" I don't find where this project is saved :/
I don't think anyone is working on it at the moment. If you start working on it, just post a comment on the issue on GitHub so people know you are.
OK, for now I will just take a look at the code, as I've just downloaded the Git version of Superpowers, and try some stuff on it before really working on this issue, but sure I'd love to work on it :3