I exported my project to a folder on my desktop, zipped it up, emailed to a friend and they opened the index.html to run, worked fine.
This can work, but it is not an obligation (in fact, for me It opens a popup saying "Games won't work until you upload them" or something like that, this popup feels so mainly by the way)
If you want to be able to share your project without a webserver, I think there is really old tutorials on how to incorporate inside a node-webkit executable without C2's help, but I am not sure I should talk about that, don't think this is against the free license conditions if you say that this has been done with C2.
If it is a problem, please make a mod say it to me and also delete the potential non-legal thingy
tutorial link: Link