The split paths feels too linier, since you're mostly stuck on the same line or going against 'regular enemies'. I also found that my run ends early if I'm not able to purchase 2-3 offensive carts within the first 2 rounds since money and space is so tight, making it difficult to not sell the payload carts almost immediately.
Being able to save a cart in the shop for later would be helpful, or at least balancing the cost for upgrading the max cart capacity.
It was interesting to play but I hope to there will be ways of making more train builds and still completing a run.