Arrow keys to move left and right. Z or Up Arrow to jump (I use Z, personally). P to show/hide suggested pathways.
I added optional rough suggested pathways to each level, and added the timer to track how long you took. I'm also trying out a more detailed time system, but it's still a work-in-progress. Original game by @PullJosh. My best time so far: 4:16.083 (Minutes:Seconds)