(Played for about 15 minutes and did 3 separate runs).
I love the visuals, very cute!
The music was also really relaxing and the loop didn't feel repetitive or as though it would get irritating. It did stop at one point I my second playthrough through and just never came back so I was left with just the bird sound.
Like others have already commented, I was a bit confused to begin with. On my first run, I couldn't find any boxes at all. On my second, I found and delivered one box. On my third run, every time I lifted the box in the starting area it spawned another and because I kept dropping them there was just a pile of them.
A couple of other small things I noted: The descend felt a little slow. Sometimes the white font was hard to see when it overlayed things in the environment. Because the buildings didn't always clear when the camera went behind them I got lost a couple of times. The arrow swinging with the box sometimes made it hard to see where it was pointing.
Overall, I could see this being an enjoyable game-loop and great job getting this submitted!