Thank you for your feedback ! That is my plan for after the end of the jam, I will add arrows pointing at empty/full station to help guide the player, and will see how easy it make the game. I could modify the bonus/malus when a cyclist find a non-usuable station to keep up the challenge.
An other idea was to have a map of the game on a telephone screen at the bottom right of the screen, indicating the state of the stations, but I was affraid it would slow to much the player to interract with it (and I didn't really had time anyway)