I really enjoyed the music in this game, it was very exciting and fitting for a racing game. My favourite tracks were the main menu and the one in track 4. Also I love the voicelines that you guys recorded, it adds a lot to the personality of the different characters. My suggestion is to add a volume slider so the car volume can be decreased, I found it drowned out the music sometimes.
The driving was fun and I love how the car bounces slightly based on your acceleration, it feels really dynamic. My only issue was it was very difficult to drift around the sharp corners on tracks 2 and 3. But it got better in track 4, which I found the most fun. In track 4 I found this speedrun strategy near the end where you jump off the track to skip the loop, but doing this caused the game to not register the lap (not sure if this is a bug?).
If you're going to update this in the future, I think it would be really cool to have a global leaderboard with best times and to add multiplayer! Nice work on the game!