Movement Code

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour
{

	//Movement
	public float speed;
	public float jump;
	float moveVelocity;

	//Grounded Vars
	bool grounded = true;

	void Update ()
	{
		//Jumping
		if (Input.GetKeyDown (KeyCode.Space) || Input.GetKeyDown (KeyCode.UpArrow) || Input.GetKeyDown (KeyCode.Z) || Input.GetKeyDown (KeyCode.W))
		{
			if(grounded)
			{
				GetComponent<Rigidbody2D> ().velocity = new Vector2 (GetComponent<Rigidbody2D> ().velocity.x, jump);
			}
		}

		moveVelocity = 0;

		//Left Right Movement
		if (Input.GetKey (KeyCode.LeftArrow) || Input.GetKey (KeyCode.A))
		{
			moveVelocity = -speed;
		}
		if (Input.GetKey (KeyCode.RightArrow) || Input.GetKey (KeyCode.D))
		{
			moveVelocity = speed;
		}

		GetComponent<Rigidbody2D> ().velocity = new Vector2 (moveVelocity, GetComponent<Rigidbody2D> ().velocity.y);

	}
	//Check if Grounded
	void OnTriggerEnter2D()
	{
		grounded = true;
	}
	void OnTriggerExit2D()
	{
		grounded = false;
	}
}