Hi!
I have to agree with the previous commenters! It is way to hard, which is a shame, because simply driving around in the testmap feels so fun, but I think the level is not doing a good job in utilizing the car mechanics.
Too much stuff you would get stuck on that, little bumps that make you loose control, corners to tight.
The first jump already was way to small for the max speed of the car. I had to break significantly to actually make that turn. A level on street with long corners with an occasional jump over a gamp that doesn't end in a tight turn (or mostly water :D) would have been a much better idea!
Also my R key did not work, which made it incredibly frustrating. Either I sit through the long menu animation and wait for it to reset, or I just try and get another attempt in on that first jump, but then run out of time if I actually do make it.
I would just reset the timer when you reset back to the start. Without checkpoints I don't really see the need for the time continuing to tick down after you got reset to the start.
Regardless, I did beat the game and think it is actually really good. Apart from that timer reset thing, I feel like it is mainly a level design issue, which can be "fixed" easily I hope :)