I love puzzle games, trains, and board games like Carcassonne… Needless to say I wanted to play your game!
Graphics are great, the concept works well. I liked the optimization aspect of the game, you really have to plan ahead. Overall it feels nicely polished already.
The game feels very random though, especially near the end when only a few spots are still available. Perhaps having a hand of tiles (2 or 3) instead of one would help?