To draw a line, click. The angle is the "angle" variable counterclockwise from straight right. So, 90 for angle would point straight up, 180 would go left, 270 would go down. Magnitude is the length of the line. Use lines to pass levels two and up. You have a limit of 3 lines and 200-ish magnitude per level. WASD or the arrow keys to move. Just to get you started, on level 2, set angle to 0 and magnitude to 100, and click just above the big purple rectangle.