I've not had the time to look at adding the spring system to the cameras, but I just added 2 top-down camera views to the sample, in light of the recent Tutorial 4 ( Make a game in 60 minutes ). The 2 cameras are Top Down Fixed and Top Down Centered. Hopefully the names are self explanatory.

Btw, has anyone actually run any of the demos or tried to compile the code? The Chrome commandline compiler is free!