I liked the concept, but found it exceedingly difficult to build overlapping connections without the buses eventually crashing (and often before they paid for themselves).
I think the game would benefit from having more routing mechanisms like tunnels or signals (see Factorio's railway building for inspiration).
Another thing I would add is that there was no urgency to build any connections (as far as I could tell). It might be beneficial to make stranded passengers disappear after a while or cost you money. It seemed like one could make infinite money by building one connection and waiting. Anything that adds urgency would bring a lot of focus to the "every 10 seconds" theme.
Finally, the controls didn't feel fully explained and I found myself confused at the beginning with the camera zoomed way in. Fortunately, it wasn't hard to discover how to move the camera and zoom in and out. Maybe a simple graphic on the side (along with the costs) could help explain this aspect.
Overall, I think the game has great potential. Besides my complaints, the mechanics worked flawlessly, the graphics were simple and concise, and the controls were solid.