-When clicking on the first level, it loaded but the map was a gray box. Exiting and selecting it again, it was normal.
-Controls are a little finicky. I wish I could just press R or some such instead of wiggling the mouse. Though you get used to it.
-In the chain level, I got the solution but it was only a few tiles over the grid limits, so annoyingly I had to move everything over one piece at a time. I would add picking up the entire track at once, or an unlimited grid/wrapping to help.
Beat most of the levels, I had a pretty good time. I imagine that if you added some special tracks that change depending on direction of approach, it may lead to some cool puzzles since the train has to work in both directions. Though as a casual puzzle game, it's fine as is. Keep chipping at it.