You never mentioned touch, or slide, or player speed. Are we supposed to read your mind? :)
Use "Is in touch" event and Touch.SpeedAt(0), Touch.AngleAt(0) expressions to get touch direction and speed of swipe gesture. Based on these values you can decide how to move the character.
For more accurate swipe gesture recognition you can save initial coordinates in "On touch start" event, and then check how far the finger moved, using distance() expression.