I like the concept of the game. I think the running slider makes this a bit hard. If you put in a pause button, I think you'd get better feedback. You need time to adjust the sliders without killing your speed. A temporary pause button would work. You should watch gameplay footage of a game called "Freedom Force" by Irrational Games. They had a hectic game with very complicated controls and how they handle it is what I think you might need. The world has to pause why you think and adjust your sliders. Then un-pause and prepare for your jump skills. You might even have rules on how often you can pause, or the longer you run the longer your pause can be etc...
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I really wanted to add an all stop button, I thought it may be one to many buttons. The best tactic I have found was to set the gravity about 75% then hold down the mouse button over the speed slider and use that to full stop or boost forward. If you set them both about halfway then play like that you can make it through after a few attempts. Thank you for your feedback and playing the game.