Very solid entry.
The game is very fun, the graphics are excellent, and your taste in music is impeccable (though it doesn't match all that well with the theme of the game).
However, I only have one complaint. Do you think you can make pointers which indicate what's on the ground below and ahead of you? That way, you at least have a chance to dodge run-stopping obstacles (like those trolls with spears). I can tell you it's not very fun when something ends your run without warning and you have no way to prevent it.