Not a commentary on this project per se, but I can't help but think when I see "X in javascript" voted up that the implicit frame is: "isn't it impressive what you can do in javascript now?" But if you flip that statement on its head, the equivalent is "The web has finally caught up with what we could do on a 1997 desktop!"
I've had this sentiment from 1996 on. I worked for a company creating Internet materials for use in classrooms (Internet-on-CD, books, etc.). I remember seeing a "frog dissection" thing on a website and everyone seemed to impressed with it. Why? You'd click a gif, it'd run a CGI and deliver a new image. Just what you could do with actual clients, just slower, more limited, and lower resolution. There's something neat…
There's a huge amount of value, as perceived by "users" of the services/applications/games, in not having to care about and install a specific client for each service/application/game.
That's why it's noteworthy when something that used to require a heavliy specialized client, such as a game, no longer does for delivering the same experience.