The visual quality is some of the most ambitious I've seen on Itch, but the game doesn't offer much for the player to do.
Some surfaces weren't textured enough to communicate speed, although you could also use effects to communicate it. There could also be more objectives, and that might require more time spent on level design; the game is currently too sandboxy to feel like a game, but it doesn't have enough tools to be a proper sandbox.
I prefer pretty linear games; that doesn't mean closing off the world, but getting the player to move towards an objective. Linear or sandbox is your choice, but you should go deeper into one over the other.