Fun game! :D
Technically, everything seems to work well, except for the zoom-out problem, but I hope you can fix that! :)
The gameplay loop is solid and well established!
Maybe the tutorial is a little too wordy, and you can complete it even without repairing a train.
This was a problem for me because I didn’t fully read the instructions while experimenting with the game, and then in the next level, I didn’t know you could stop the trains by clicking on them!
Hard lesson to learn: players don’t read! xD