I can see why this was made, looks like a fun project and the kind of thing I would do to organize myself, but the reality is (as tracker1 implied) that you can easily provide all this functionality with just a package.json.
I can't disagree more with the presumptions that are made in the description that Make is easier than JS to understand. Make requires other build tools to be installed, and depending on the environment that is complicated, if you're in a more locked down windows environment, it's downright difficult.
Not to mention that I don't like the idea of bringing in tools you don't have to. More often than not lately, I don't use grunt/gulp or the like, simple npm scripts out of package.json, and if I need more, I add them to a `//scripts` directory and call them via npm.