Player movement was previously implemented with a transform.translate function moving on the respective axes by the player's speed. This caused the issues of movement only being possible in four directions (vertical, horizontal and diagonal) as well as movement in diagonal directions to be faster than on the x and z axes. This is because moving by the player speed on the x and z axes moves the player by more diagonally (Pythagoras Theorem). After considering solving this issue using an atan maths function, I ended up using a character controller and simple move function with clamp magnitude to keep speed in any direction clamped to a fixed value.