Very creative idea, and I like your implementation of splines. I found the tutorial useful to work out what to do. Unfortunately, I didn't have a fun experience playing the game. There were many bugs that I encountered (the train dying upon spawning making levels not solvable and requiring me to fully restart the level, the track pieces spawning multiple times on top of each other, which sometimes caused the whole track to turn invisible, and the fact that it's possible to place pieces on the station tile, which are immovable and indestructible and requires a restart of the level). Maybe I missed it, but there is also no level select. I like the post-processing effect with adds an outline to everything, including the trees. The physics of the coaster train was funny too, and it was enjoyable to watch it speed round the track and crash off the edge of the map.