Here is an interesting interactive Flash game. Rather than just play the the level, you also draw the level. Guide your character through the obstacles by using your mouse to draw walkways and then use your arrow keys to navigate your walkway. To go straight up, just start drawing a line underneath your character. There is one noticeable bug that might get you and that is when you fall from a pretty long height, sometimes your character will fall through a platform your drew below for it to land on. You can get around this by drawing a couple of lines one underneath another.