As said in the description, only the first level is free, you need to unlock the full game with IAP for 2,69€ after you run approx. 2000m in the first level.
What I don't understand is the widescreen resolution on my iPad mini with retina, so the black bars on the top and bottom of the screen. Why? It says it should be universal. And it's not the first game this week with the same issue.
I know it's not the right place to complain but it seems that with new iphone's resolutions it's starting to be a problem to keep the apps universal. I just hope iOS gaming's not going to slip into Android experience:-/