A lot of fun. You already wrote in the comments the animation is buggy in web but I think it may be the collision box, 1/2 deliveries fail even if I am in the right place. Regardless, did you notice you can drag a buncha cars and prevent them from exiting the screen by standing at the screen edge?
Lotta fun.
Also when making a game always think of winning and losing conditions, that small improvement makes a game loop and improves the game a lot! Nothing wrong with a game that caries on forever but I don't really know if there is more game hidden