Fantastic! I loved all the visual and sound effects, it's really fun (especially the introduction)
Gameplay is also good, I really liked this race against time (or against train? lol) to put the tracks, but I wish there was a way the tracks with keyboard input, although I know it's probably meant to be a mouse based game... Maybe if I were able to use a track more than once?
Other than that, great submission, keep it up!