This is a really well put together and polished game. However I could not figure out how to successfully ship their orders. No matter what I did I checked the bike was correct and they still got angry... Eventually I just started throwing them all into the completed order area to make it rain poop.
Viewing post in Chimp Bike Shop jam comments
O sorry that the game is not clear the only real hint the game gives is don't forget the monkey on the wall.
To ship a order successfully you need to put the monkey on the bike that ordered it.
On the itch page it also explains what you need to do in the How To Play section but that is not a excuse for not making it clear sorry for the inconvenience.