Love to see the game on Unreal Engine!
It was said already about missing sounds and fall out of track, so I won't repeat.
I fairly would like to suggest to add a sound effects, music, and invincible walls to prevent the falling out of the track, or make a trigger volumes which will return you back to the track as well.
Neon Visuals are Great and Impressive. I like that most :)
As UE Dev, feel free to check out my game to see what we can achieve with our Engine. That would be useful for You too ^^
Thanks for attention. Keep Up the Great Work!