Agreed, also, differentiating between "touch" and "mouse" events would be a good idea, using a mouse or touchpad for this was kind of a weird experience.

Not to mention supporting left-right arrow key binding.

That said, if this was for a mobile-only interface (Apache Cordova, or similar) might not be so bad. Didn't look to see the implementation details, but Angular, React and Bootstrap compatible versions of this as components would be awesome.