Firstly well done on getting a game out with such a huge team! Kudos to the teams communication skills!
The start screen is cool but it took me a few moments to realise that I was looking at the menu, it felt like something more was going to happen. The buttons need to stick out a bit more, especially since there are other images that look like the buttons.
The audio and art is awesome! I really like the detail on the props and the animations that made the level feel alive. There is a great deal of polish in this game which is fantastic! The level layout is really interesting but I found it hard to tell where I was able to traverse. The walk cycle of the main character makes the movement feel sluggish and it felt odd while running. Also I found it hard to swap between the player characters. I wasn't able to tell but do the characters move at different speeds when holding different weighted boxes? If not why not? It would add an extra layer in the decision making.
I can see it being similar to games like Overcooked or even Lovers In A Dangerous Spacetim, where you have to work together towards a goal. One being against the clock, the other being against foes. It would be cool if you could play against another team and sabotage their packages or conveyor belts. Unfortunately your game didn't have much of an incentive to fill up the trucks other than the fact that you could. Without some sort of driving force, it just felt like a chore which wasn't very fun. With a bit more work on developing that aspect, I think you would have a really awesome game!