Pro tips for getting started:

• holding ONLY "W" when you click a grapple point will result in a mostly upward trajectory
• holding ONLY "A" or "D" will result in a very horizontal grapple
• holing multiple direction keys will give you even upward and horizontal speed
• you get score multipliers for things like being in the air, wall jumping, heck even swapping guns gives you a temporary multiplier for a few seconds
• debug mode is very useful for beginners plus there is no longer a penalty for having it enabled, try focusing your eyesight on the reddish pinkish box (that's the camera object) 
• if you just really have a hard time getting a style rank and want to take it out on enemies press "0" on ur keyboard and go bananas