I liked it a lot as an engine. Game-wise the first things I'd add would be car/tire damage, fuel use, and scattering replacement parts nearby. Perhaps off-road tire tracks could sometimes lead to wortwhile loot, but often into danger. Since it's post-apocalyptic, a geiger counter or wild-animals seem like natural extensions.

I don't care that it's vibe-coded, the author has clearly invested time and effort in tuning the feel and controls, as well as getting a natural feel for the procedural landscape which makes up for the low-poly visual. The driving experience felt much better than most other games I've played, where steering and acceleration involve distracting levels of over-correction.