Game fits the theme. I didn't feel overly pushed to utilize the other bus driver once I got the thing moving, I was able to creatively path around that mechanic. I really enjoyed the mechanic of switching, was disappointed I was able to work around it.
If I had to make a suggestion, I would just say to try and plan out the level design to force the player to utilize the two directional nature of the bus more, make some tight corners where you really need to switch back and forth, or dead end some of the stops perhaps.
Enjoyable gameplay.