Nice track/train game not sure I got the best time on all the levels - maybe a star system which would have shown you if you have the optimal answer.
Music was fine at first but got a little repetitive so turned it off - thanks for making that easy.
The fact that you had to exit to play the next level was a little strange - understand time constraints but a popup when you win asking: try again/next level/menu would be a nice addition.
Overall again, nice little puzzle game and like have the levels progressed.