Once I got it, I enjoyed it, although I did have to restart the game like twice before I really got it. A little more time to get started would be a great help (also you already get enemies running in while you're reading the tutorial — that was a little rough).
Nice game! I got 554 points in the end (much more specifically: 554.89133999997 points). One thing is that I really couldn't figure out was how to rotate the boxcar open, but I was able to keep the trouble meter down with the other tasks, so it wasn't a big deal.