Great game you got here! Opening it up the first time, I was really impressed by the polish and visuals! overall the game feels like a full release, definitely not something made in only 4 days.
That being said, I never got past loop 4-5. As others have said, you very quickly get into unwinnable scenarios due to various things like stations often generating without being able to connect them :/. I also would've loved more visual feedback on the upgrades working (The yellow text when passing by a visited landmark is a good touch, but it could be a little bigger).
Despite all this, I did end up playing way longer than I planned to, aching to see more of the map and actually get going with the upgrade system. I would love to see this game tuned and fully released!