Honestly the only reason I died was because I switched out from Archer towers to crossbow towers.
Ya'll have scored way higher than I ever have. What train cars were you using? I've found witches + archers to be the best combo, their upgrades are pretty powerful.
I solely used Archer cars, at later upgrades they just melt everything.
I used a pretty random mix of everything, had max upgrades. Ended with almost 10k gold in the bank