Very fun! I gotta say the promotional gifs for this game are rad! I was excited to try this out from the first time I saw you posting about it.
I found the combination of anti-aliasing and the jitter, particularly when accelerating from zero really unpleasant. I think adding fog or doing a screenspace shadre to help with that would go along way.
I found the car's handling pretty unforgiving, but I was getting the hang of it by the end of the game. I wanted more opportunity to do cool handbrake turns and such.
I appreciate the variety of levels. I think the more open space we have around the road, the more the game holds up, giving you both space to optimize your route and a little forgiveness if you overshoot.
I would have loved to see past attempt ghosts or something along those lines in lieu of opponents to race against.
I really would have loved some engine sound, tires skidding, etc. Something to make the car feel real.