I thought it was well done, although I agree with Zensteve that the camera motion could use better stabilization at points. The editing could be tighter as well - there are several cuts where you could pull a second or two from the next shot and maintain a better flow of the action. For example, he walks towards the camera, you cut to a reverse shot of him walking down the trail, but he's still visibly picking up speed from a still position - so it doesn't look like a continuous motion from the previous shot.
I also think the ending should be cut much shorter. You need to trust the audience to get it - there's no need for the additional close up shots of the wheels, etc. He opens his eyes, we see the handle behind him, his friend says 'we need to go now', and you cut to them turning and heading off down the trail. As it stands now it feels like you're beating the audience over the head with the twist a bit.