Merlin4 has a lot of good feedback as those were some of the things I wanted to mention. I did feel that the run speed should be controllable, however you may not make it to the end if you slow down too much. So instead of having an end point maybe you could have an "end of the day" point so after 25 pieces are delivered the next level is available. Still on a time limit of course. This reminded me of paperboy. Good memories :-) and good job!