I like the concept but it needs a lot of work to turn it into a full fledged game.
You could fall off the train but it wouldn’t be considered a death (so you had to reload the game).
When I die I don’t want to watch the intro every time (maybe just the first time).
I think you need to have some kind of upgrade system unlock better weapons, more health, have more enemy types etc.
When I was standing at the front of the train (close to driver - I was able to last a really long time because the other spawners were so far away I was able to pop them off before they got close).
Glad Everyone likes it. Of course there will be big changes need for it to become a full game but I think this is a really good start especially for a game made in 48 hours.