I've kept failing to i watched the walkthrough. I shouldn't have fined the visitors? Just banish them? That's strange.
Apart from that really great job. Very polished, stylish, interesting game. Can be turned in a bigger game also. More routes with more than one stop, more types of visitors, more ways to fight them, need to combine two ways to counter one visitor (like refund 100 and then 10), commands that you need to do on passengers sometimes (maybe to get clues on other passengers), ways to identify visitors by details on sprites or by their words, visitors changing their behavior when in pair with another set visitor.
And maybe a button for sprint. Also movement could be done by holding right mouse button and conductor will move in direction of cursor, to left or to right, just sayin'