The map seems reasonably clear. The one on the left is the easiest, and the deliveries get harder as you progress to the right. I only managed the first, but assume that getting all 3 would unlock the forth. Adding additional details such as how much money you get from a delivery, as well as showing your current total cash, would be good. It would also be nice to see the deliveries you've completed marked on the map.
I never quite got the hang of the kicking. It felt like sometimes I'd barely get the box to move, and then I get a "lucky" hit and launch it down the hallway, usually past the turn I needed to take. I found a single kick almost never moved it far and I need to kick once to lift it up and then again to move it, but the timing and angle of that second kick had a big impact. I never quite felt fully in control. I managed to get close to delivering the second package several times, and once thought I'd made it, but it did not show as delivered, so I must have still been a bit off from the target zone.