I am SUPER proud of this game, since it is my first platformer EVER!! :D You move with the arrow keys and try to pass the 20 challenging levels (most of them)! Please don't complain... It is my first platformer... ...and YES, ALL of the levels are possible!
I give a GREAT thanks to @DaphThis for the basic info and help, And a BIG thanks to @MajesticPie for an important script!