I would have liked to buy an upgrade every level so that I could feel more of a sense of progress, but it took several levels before I could purchase my first flamethrower. I do wish I could have held the button to continuously fire instead of having to rapidly click, which is hard on my wrists.
Adding cars which shoot stuff almost feels like a game of Snake, with more artillery. Good enemy variety.
Music matched the feel of the game very well. Nice CHUGGA CHUGGA feel.