I had fun.
But not for the right reasons.
For challenge aspect all you have to worry about is gaining enough speed.

Now... this is the most fun i had with a broken game so good on you for making it entertaining, how ever i am sure you meant to program, that if you end up upside down you have to restart.
Which let me tell you IF that is what you had in mind let me tell you that it would be beyond frustrating.
So either way you're in a catch 22 either you make it beyond silly broken and have no challenge, and people will complain about that.
Or you make another Spongebob car game in terms of difficulty, and people hate it for that.

Either way, might wanna look over what went wrong, and ways to tweak the controls.
But, then again this concept is nothing new. but thanks for the 15 minuets of time killing, it was funny to watch my upside down super car move at the same speed as on wheels ;)

Try again.