I know it's out of early access, and you already worked really hard on it. But I have some problems that need to be addressed.
First, the physics. This is a physics-focused racer, and the physics just don't feel good. Maybe it's just how the levels are designed to be unforgiving. Constantly causing you to fly into the air, get spun into the wrong direction, or punish you for going slightly off the road for just a few seconds. Drifting doesn't feel good, at least compared to other games I played where it was less stiff than the large hover car, and easier to control than the hover bike.

If you can't adjust the physics, at least make the collision in the levels more forgiving.
For example, the ropes have no collision, but the posts do, always making you spin off to the wrong directing when hitting. Ropes should just make you bounce off like walls, to keep you on course.
Make out-of-bounds more forgiving to allow more slip-ups and shortcuts. You made these large maps with lots of drifting and hovering around. Put them to use.

Second, levels being locked off by medals is not fun when considering how the physics and unfair level designs make you constantly restart from the smallest mistakes that happen frequently.
Allow players to just play the levels without needing to go for all those medals.

Third, add audio sliders and v-sync. I was able to apply v-sync through my control panel, but this should not be expected of every player. And some players prefer music lower than the sound effects, or maybe even no music so they can listen to their own playlist while racing.
Also, audio keeps playing in one ear when restarting, but goes back to both ears when the countdown ends.

Fix/address this major issues, especially the physics and level design, and you got a fantastic experience.

Thank you, and best of luck to you all!