Hi, SoW. I tested your game for a few minutes to give you some feedback, you could take it or you could ignore it, do as you please.
I'll start with the negatives.
First of all, the elephant in the room to me are the physics... They are so, so bad BUT they have potential, you are getting there. Cars feel like weightless spheres, I don't feel any kind of connection with the car, I don't know what the car likes and what it doesn't, I don't know if there's brake to drift or if there isn't, if you hit a wall you either wallride it or you stop completely, and so on...
The map is functional, but is not adapted to the physics or the other way around, you should take NFSHP2010 or Burnout Paradise as the best examples to what you could do.
The landscape is very weird, but it can be dismissed as it's a demo, not a final concept.
Finally, the sound design is passable, but tires should make noise for some feedback and the BoV sound shouldn't trigger everytime you leave the foot off the gas, you could at least add a sort of timer that requires the car to go full throttle for at least 0.25 or half a second for the BoV SFX to trigger.
The weapons are O.K., the purple bullets should decrease speed and not push me and then send me flying like a balloon. The aura ring thing that pushes the drivers is good, but maybe it slows me down too much, but you can keep it as is as I might be nit-picking too much.
The positives now.
I like where the art style is going, looks good and I get the vision.
The fendernet is fantastic, I love how quick it is and how easy it is to use.
The sense of speed is really good, a bit over the top but remember, that's just my opinion.
The UI is good, easy to read, although a map would be nice to have, and I'd maybe rearrange the UI elements, but that's just me.
Overall, you are doing well, keep it up! I couldn't test MP since I wasn't interested, but I bet MP is pretty fun. You should add some music next and transitions to races since it's a bit too dry to just start... and also camera rotation with the right stick would be nice.
Godspeed!