I like the idea of the game and the effort of doing it all yourself and not even using a game engine.
The game feels promising. I think if you would flesh it out a bit more it could become a really nice puzzle game with a pinch of an economy simulation.
It took me not long to understand the game but I had some issue when a car exploded and I tried to optimize the connections afterward. I was not really clear that a certain factory and coal plant always belong together. They all look the same without any markers like numbers or anything.
The spawning of new buildings is also weird. It happened more than once that a new building was placed right next to an existing road or even on it. This of course leads to a disaster :D
Overall a very interesting entry. Well done!