Wow, I didn't expect I will like this as much as I did. This is a really neat idea and could probably be turned into an actual product. If the author added some more content (like some landmarks sprinkled on the landscape every now and then, possibly some varied terrain eg. bridges over rivers, cities/villages, windmills, dams, maybe some simple wildlife, etc.) and released it on PS4/PS5 for few bucks I can imagine it could sell pretty well.
Edit: Seems there's actually a way to support the developer on Ko-Fi: https://ko-fi.com/slowroads
Edit 2: Also props for good optimisation, it runs flawlessly on my M1 Macbook even on the highest setting.