This has a really well polished, clean artstyle! I enjoyed your entry, at the end I had a train going around the center with nothing but shotguns, so long that the last wagon was right in front of the train :D
As a small critique, it was difficult to get a hang of the controls. I needed to restart a couple times because I screwed myself as it wasn't entirely clear what the buttons are doing. Some more direct feedback there would be much appreciated.