The look of this game is so professional! The subtle floaty-ness of the tiles, hexagonal consistency of the world and UI elements, and simplicity of the fonts make it almost seem as if it were coded into Tabletop Simulator; it truly feels like something I'd see on Steam or the shelf of a board game shop. The name of the game is also very clever.
Gameplay-wise, the onboarding phase of the game was straightforward and easy to learn. Although it initially scared me with the number of controls listed in the game's description, it turned out to be easy to master with the help of the important control scheme being listed at the top right of the screen. It wasn't long until I started just jumping through the different levels and planning where to place my tracks. (That being said, I think it's a bit difficult to figure out which tracks are ones you've placed, and which ones are locked on the map. I found myself stuck on the level with two trains for a while because I forgot I'd placed some of the tracks myself.)
Additionally, for the few levels I've tried out, the level-building is nicely done. I like how you balance the challenge of figuring out how to rotate the pieces, along with the fact that trains can collide with one another. The steady introduction of mechanics overall feels well-paced.
Overall, great job!