Well, not a very new concept, but never mind. :)
It's already some fun, and music and sound fit nicely. It gets interesting with the speed increase. Make an increase earlier and not as abrupt, then it would be better. It's not clear what the various coins make to the score. An animation of a stumbling person at game over would be neat, too, as well as some variation with the backgrounds. Some innovative idea should be added to make it stand out a bit, maybe?
And very important: volumes are set to zero by default. So many ppl won't even notice that you have sound and music! Better change that... :)