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You can click on each chip at the start of a level, and then assign a button to it by pressing "a" for left, "d" for right, space for jump and left shift for use.  Then, once you start the level you can hit each button that you've assigned, and you can hold it down for as long as you want. However, once you let go that chip is used up for the rest of the level.

Thanks for giving it a try! You can hit "r" to restart a level

Thanks for playing! The last page of the tutorial says to hit "r" to restart each level