Click, Up Arrow or Space to jump. Don't touch the edges or the green tubes. As you progress through the different difficulty levels, the tubes can be angled further. At 40 score, the pipes start moving up and down. At a score of 40 (Insane Level) the tubes begin to move up and down on their axis, so look out!
I guess thanks to the person who made Flappy Bird for inspiring me to do this?