I LOVE THIS! One button control for a driving game is brilliant. It's wacky and it's different and very fun. One of the funniest things was just barely missing a turn and thinking "well it's time to GO FOR A LOOP". I got 3 minutes 8 seconds if you're wondering.
I liked that I could restart at checkpoints, although it was a little disorienting to be rotated to what seemed like an arbitrary direction when I hit R.
Again I really love this idea. Although the controls were quite slippery, it felt like that was intentional given the roughness of the terrain. Great job!