Some helpful thoughts
The idea for this game is quite good but there are a few issues that need to be resolved first.
First, if you are going to stick with the control scheme, at least reverse how it is done. It should be that you click the mouse to jump. Hold the button to stay put, and release to run. The timing and work MUCH better that way.
Second, an alternative style would be to have the level side-scroll as you merely hit the button to jump as it scrolls. The flaw with this is that you have to have the timing down right away or you could fuck up... which is why option one is much better.
Overall, the idea for this game is good, but it isn't executed in the best way possible. Better luck next time and hopefully these ideas helped a little.