I agree that adding more assets would make the game feel more polished, there just wasn't enough time.
However, it sounds like you only played the day shift, which is meant kind of like a tutorial. When you have picked up 6 boxes (2 complete orders), you will move on to the night shift. Which does have more challenging elements like a timer, and I won't spoil the other challenges, but you'll notice them soon enough. Please consider trying it out again, to get the full experience!
You can throw the boxes by pressing E or left click while holding them.
