Good concept. 

You definitely got some good building blocks in there. The modular graphics for building out a world, the smartphone overlay which will be a good format for UI, and the trains passing beneath the tunnels. Despite being unfinished, it's good you got a web build and pressed on with it--all the work is cumulative anyway, so any challenges/setbacks/trial & error is never in vain, it is still progress!

A very simple game, and, as you said, not finished, unfortunately... Keep up the good work, finish it and learn from it to come back stronger at the next jam =)

Not sure if I died or finished the game. Metro was a cool idea!

I liked the train assets