Cool app, but I can see why it didn't grab peoples attention.
It's not very clear what to do when you land on the page and there's nothing to explain what it does. I wasn't sure what I had to put in for the start and end location. Is just a city name ok? or does it need a full address?
I'd suggest having an example location already selected. That way instead of asking the user to do something they can simply click the play button and immediately see what the app does.
You've got a nice interface there. Needs something to facilitate picking endpoints & paths with Street View data, else it gets frustrating fast. That is in competition with this thread, which features a nicely-chosen video sequence which includes non-automated focus on scenery features (like contrails).
https://news.ycombinator.com/item?id=5469218