- Framerate isn't wonderful (20 - 30 fps on my laptop, which will happily run graphically more intensive JS demos at 60fps usually), and I see you're using React: is using a relatively heavy framework the best way to go here? Possibly this is fine and the optimisation is required in other areas instead (e.g., are you creating loads of garbage?),
- Car physics and handling is way off: clearly for this game realistic handling probably isn't the goal, but it's bad by the standards of more recent arcade racers (Burnout et al, Cel Damage for something that has a slightly similar aesthetic), or 1980s style 2D racers like OutRun (or more recently 80s/early 90s-esque racing games).
It's certainly an interesting demo - and, as I say, I love the way it looks - but in terms of demonstrating ClojureScript as a viable platform for game development, definitely needs more work. And in terms of this being a game, it's a long way from that: no objectives, no other drivers (depending on the objectives, may or may not be required), no hazards, pickups, etc., no sound, and so on.