aurium
Implement a game lobby
http://www.html5gamedevs.com/topic/7767-js13kgames-competition-2014/page-3#entry48410
The main page on port 80 may list the games and connected players.
A chat-room is also needed for this feature.
If i understand correctly in your proposal a sandbox is capable of running multiple games, this way I think it would be great to have one separate node.js server to host the lobby itself that could connect to multiple game servers/sandboxes via TCP on the standard client port (this can become useful in the case if one sandbox server is not enough to run all the games at once). In the lobby I think it would be nice to have separate "rooms" for each game, listing the currently available sessions (and also hosting a simple chat).
Good! But we must to consider the time. For this year we may code it in only one server and only one room. For the next year we can make it greater. :-)
I don't know if we can do it for 2014 competition, but that is may proposal:
The mock-up looks great, although "Game info" should contain the list of the active sessions available to join (i.e. ones that need more players to start) and a "Create new game" button I think... or should every dev create their own implementation of these? Hmm...
Well... I was thinking in an API for games inform things like winners and records... So your proposal fits nice. :-) But... for now (2014), the game must be responsible for it's sessions and rooms.