This is quite a nice little game with local co-op in mind! That's rare in a game jam. This alone deserves some kudos. As for me, as I don't have anyone else in the same room at the moment, I will only play solo instead. The gameplay is tense, and the levels are well-designed. Just that I am not sure if the game is balanced for solo or not. The graphics of the game are nice too, with that cartoonoic style the game certainly looks good. For some criticism, I'd say the character is walking too slowly. I would suggest making it a bit faster, or at least adding a dash so that the players will spend less time on the boring walks and more on the fun of redirecting boxes.
Anyway, this is a good entry! Good job!