The examples look impressive and all, but that's due to clever coders. The library itself is just a cleaner interface to draw stuff rather than using the html5 canvas interface. It would be a nice alternative to C2 to make a html project if you like scripting, but putting it inside C2 would be clunky to use imo.
You can already draw curves with the canvas plugin if that's what you're after. I don't see anything in this library that makes that any easier.
To make it work with C2's collision and physics system the curves would need to be converted to polygons. Doable but probably not the fastest considering C2 prefers you to use collision polygons with 8 or less points.