Great job getting this much in. Looking at Antimuffin's comment, I'm curious if starting the actual challenges requires reading the note on the seat. If not, that'd be almost a softlock. Similarly, I didn't see any indication that the game require audio to finish, nor did I see any in-game visual matching what the audio was doing. I'm not sure how someone who's not in a good position to listen to the audio would be able to finish the game.
Besides that, I noticed that I was able to go below the bottom of the screen, but doing so caused the driver to be unable to get back up.