Glad you got your game in in time. I played a few levels of your game (didn't get to the end of the game yet though).
I feel you could have implemented the rewind mechanic a bit better; as it is you can't really hit any normal blocks or you lose, and hitting a rewind block also means you lose just slower/more painfully haha. So while it was cool you got the rewind feature in there, it felt like the impact of hitting a rewind block was the same/worse as hitting a normal block.
I'd also suggest making a snappier/quicker response for moving left and right next time, as the car felt a bit slidy/slippery to control (which might have been intentional, wanting the player to look ahead more, but I think for games like this it helps to be able to react quickly rather than learning the level layout). Potentially you could use rigidbody.velocity instead of applying forces to the car (which is what i'm assuming you did?).
In any case, well done on getting the game in! Hope you had fun developing it and I hope you appreciate the feedback :)