i accidentally hit space and it messed up and i had to restart, other than that its good
Not a flaw
Everything is unlocked because all the parts react different to the environment. The idea seems to be that every area can be completed different depending on the parts used. I myself prefer Tyre C, Springs B, and Engine C. However I did get bored that the idea is just ... Follow straight, keep the truck level, get to the ribbon. No power ups, no nitro, no extra points for flips, nothing too special really.
Its a good game, standard side scrolling driving game but with one major flaw.
At the start of the game everything is unlocked, if they were achieved through high scores or completing levels it would've kept the game interesting.
Other than that the games pretty good, keep up the good work