Yes, it can be a bit frustrating at the beginning to only drive towards mountains, but if you use the green shield you will be immortal for 10 seconds. I didn't want to make the game too easy :)
"The coins and powerups are randomly placed, which is good, but makes comparing high scores useless in many respects."
By the way, games like Subway Surfers also place randomly things and you can compare highscore, because every player uses the same random generator.
My current high score is 11,000.
But thank you for your review ...