Spoilers : When the first car appears, go backwards, and when the fourth one appears, jump to the short rock.
I'm dying after all 5 cars have passed and I try leaving the short rock, I think that's the same problem he's having. We get the "flying car jumpscare." Are we going out of bounds, or taking too long? I'm stuck.
Ah ha, there WAS a sixth car that was spawning on top of me! The flying car was timed, but I kept dying to that last car without seeing it.
Man, you must check my video in the comments section of this game. It will help you to get the "True Ending"