A very clench worthy 15 minute game! The tone is established very well and I was on the edge of my (driver's) seat throughout most of it. I really appreciate the restraint you demonstrated in terms of the jump scares and letting the environment breath.
If I had to offer any suggestions it would be 2 main things I believe will add to this.
Firstly I think there should be at least 1-2 cars in the first half, even if the location is isolated, I think it'll let the world feel ever so slightly more alive and immersive.
Secondly would be in relation to the sound. Given the remoteness of the location, doing something with music on the radio could be of great help. Something as simple as having it cut out and become more distorted the more and more remote you are. There can also be the chance to put in signals from... other places as you approach the end, assuming that would suit the narrative you're trying to tell.
Overall it's solid and I was happy to make a video covering this game!