Pretty cool game! Though, it does get a bit laggy when there are a lot of enemies. Also, in the last level I was often getting stuck on walls resulting in a game over. When the game restarts, it doesn't reset your input or something; the guy keeps moving even though you're not pressing a key.
I actually had an idea around trains as well, but more centred around stealth and I had to cut a bunch since I spent so much time on procedural world gen; lesson learned I guess.