[MichaelHoste]

Yes of course I had multiplayer in mind the whole time. I even started a Rails application here for that purpose: https://github.com/michaelhoste/xmoto.io (it was more of a proof-of-concept)

But I'm afraid of the tweaking of the physics once the multiplayer game is started (and replays are created). Do I need to freeze them once-for-all and only work on supporting more levels or create an editor?

I still have plans for this project, but this is a side-project and like always, life happens and free time disappears...

EDIT : the work-in-progress is in fact in the "pixijs" branch, I almost finished the rendering engine switch to http://www.pixijs.com/ (higher level of abstraction, more cool 2D effects)