I felt the game was let down by the camera movement, maybe a fixed camera per carriage would work better, or just don't move it in Y unless you have enemies come from the south.

The controls felt a bit odd, I tried to use space to purchase items. I didn't seem to get enough metal to do anything useful with it.

Some basic sfx would have helped a lot for feedback about shooting/hitting.

Camera was very hard to control but other than that the game worked fine!

It is fun

The camera is very hard to control and there's not much of an indicator for when the train is actually going to crash.  Still pretty fun, but I wish you gained metal faster

very addictive