As you can see, it is moderatly actively maintained. More developers are welcome.
Without that feature it is quite difficult to plan at a high level especially as the number of cities grows (and I play large pox!)
I honestly expected it to just crash, but it worked well enough.
Awesome project, I'll consider playing a game on my desktop. I play occasionally with the desktop version, but a web version is much more accessible for new players to try out casually.
It is a pity that most old games are lost instead of open sourced.
Entirely playable performance-wise in my book.
New 3d Game 
New 2d Game