For a runner game, it is very easy to think of ones I'd rather play, but I still get a reasonable amount of enjoyment from this despite it's frustrating difficulty. Overall, the things I liked are the music choice, and the fact that my full attention is required to play this.
However, I think an easy step for improvement could be one of many things. Checkpoints within a level come to mind first, but I also like the idea of being able to place landmarks of some sort, so that the jumps you've already completed wouldn't require precise timing every time you fail later on.
This is a great starting point, but it isn't there just yet. Keep working at it! :)