Someone pointed out to me a couple cities which don't generate properly, producing errors in the Javascript console, so I linked them on a Github issue. There's some commonality with my earlier github issue about a particular seed/size combination which doesn't seem to function.
I just thought I'd mention them here since it doesn't seem the Github has much interaction.
If anyone else has encountered parameters which don't generate a city at all, or generate everything squashed into one corner, please reply with your examples!