I had a good crack at it but after a while I couldn't pick up the boxes. I did enjoy breaking it a learning how to fling across the map though, haha. Theme is great and I like the gameplay/progress loop.
Yea its a bug that i was too lazy to fix. When you dont drop the box when delivering the game still thinks you have the box and wont let you pick other boxes so you have to drop it or throw it before delivering.