Quite a trip! I think the suspension needs some work :) I was having the worst time steering, it was severely pulling to the left. (maybe one of my controllers is plugged in and drifting), it might be good to accept input from only keyboard or controller.
also the shifting was a little tough, I kind of wish the controls were laid out so that it wasn't all just the left hand.
Can my right hand do the shifting, and clutch, and gas pedal or something?
I like how the engine sound changed with the rpms, but I wish it had some other sounds.
Also, a UI would be nice to add, like a HUD with a speedometer and such, and something other than the default Unity buttons and font and such.