I did start by have the player be able to use W/D but the problem is the Y distance from the player to the grapple point. Say if you press D when you are under the grapple point then you swing anti-clockwise, but if you are above and press D then you go clockwise. The problem with this is that when the Y distance is short, meaning that the player is very close to being classed as "above" or "below". As its a very close, you may try to press D to swing to the right as you are falling, only to be propelled clockwise, which is still to the right, but its above the grapple point instead of a natural swinging motion. Therefore I decided to base the direction from the cursor relative to the player and the grapple point.

I used grapple points because it makes for easier linear level design and it guides the player so that they know where to grapple.

Thanks! I'd like to know what you mean by "some problems with the controls". The only controls are LMB, RMB and LSHIFT. It takes a bit of time to get used to the physics and controls but its quite fun when you get the hang of it (well for me at least).