I stopped it at 62 when ont trying, later I managed to stop it with 48 doing mainly crits and getting one angel statue crit it a well. I think it might be an interesting idea to follow - not necesarily with "looping" or "what's the amount of killed people to stop the train" but as a logical game, where track-switching and obstacles on the tracks can impact your trolley. I liked the minimalistic look, red sharp color of blood could really add accent here.
Is it just a fun little demo or will you build it up into something bigger?