I've been killed kicking around the idea of doing something similar, in go, with the domain I own ChatFor.Us

JavaScript encryption, as others have mentioned is the thing I see I was planning that's missing from yours.

I'm planning on going a different direction with the domain, this functionality for private messaging for a platform set up for chat rooms as well.

Right now though I'm investigating a node.js and rethinkdb infrastructure, but that's also because I will need to persist data somehow.

Thanks for building this, at least validates that someone else has similar ideas.