Really polished and fun deck builder!
First of all: the UI transitions are really fancy! Starting a new round and seeing the wagons. Perfectly! I also liked that you had to put the card onto the train wagons. A nice touch.
Two points of criticism: the game could really benefit from sound effects since the visuals are so nice. A crashing sound when hitting the enemy. Second: a wave counter of some sorts. I got really far, but I lost track of the number of waves :(
Nice and effective. Thank you for this entry!