This game looks really polished, well done. I like the art style and music. The bombs were so effective however that it crashed the game multiple tries so I had to give up unfortunately, but I think you executed your idea pretty well. I know this must've taken a good few hours to make but if you had more time I would have invested that into a level select on the pause menu, because right now it takes quite a while to get back to where you were especially after a crash :P
Oh btw I really liked the fact that the train sped up if the track was completed. A welcome surprise.