Pretty good start to a nice little runner. You can certainly feel the speed. Hopefully you keep it up and keep working on it after the jam is all over. My only two nitpicks (besides audio) is 1) Maybe kill the player without letting them fall for such a long time, and 2) I think the camera MIGHT need to be a bit higher....I'm on a kind of small laptop screen, but I had a tough time making out the distant terrain.
Anyway, keep it up!