A very polished game that I find very relaxing to play (I could probably keep playing for hours). I found the UI very intuitive, especially with the tooltips. For the controls I would have maybe labeled [Left Mouse] as "Click Button/Drag-and-drop" to clarify.
Also I have noticed there is a bug with the parcels snapping to the grid: When placing stuff on the back bumper it's not in the truck so gets left behind. If there is only one row of space, a two-wide parcel cannot be place there, however by letting it go at the right position between bumper and last row, it will sometimes snap to the position of being half inside the truck. The parcel doesn't count towards income, but it messes up the allignment of all the other parcels, making the placement of subsequent parcels look a bit wonky. This doesn't really affect my rating of the game (I still find it adorable), just wanted to let you know :)