PlayerControl.cs

using UnityEngine;
using System.Collections;

public class PlayerControl : MonoBehaviour {

	public float moveSpeed;
	public float jumpForce;

	private Rigidbody2D myRigidbody;

//	public bool grounded;
//	public LayerMask whatIsGround;

	public bool floating;

	public bool goDown;
	public bool ready;

	private CircleCollider2D myCollider;

	void Start () {
		myRigidbody = GetComponent<Rigidbody2D> ();

		myCollider = GetComponent<CircleCollider2D> ();

	}
	
	void Update () {

//		grounded = Physics2D.IsTouchingLayers (myCollider, whatIsGround);

		myRigidbody.velocity = new Vector2 (moveSpeed, myRigidbody.velocity.y);

		if (Input.GetKeyDown (KeyCode.Space) || Input.GetMouseButtonDown (0)) {
			if (goDown) {
				myRigidbody.velocity = new Vector2 (myRigidbody.velocity.x, -jumpForce);
			} else {
				myRigidbody.velocity = new Vector2 (myRigidbody.velocity.x, jumpForce);
			}
			goDown = !goDown;
//			if (floating) {
//				myRigidbody.gravityScale = 5;
//				floating = false;
//			}
		}

//		if (Mathf.Approximately (myRigidbody.velocity.y, 0)) {
//			myRigidbody.gravityScale = 0;
//			floating = true;
//		}
			
	}

	void OnCollisionEnter2D (Collision2D col) {
		myRigidbody.velocity = Vector3.zero;
		//Code for restart level when touching wall..
//			if(col.gameObject.name == "wall")
//			{
//				Application.LoadLevel (Application.loadedLevel);
//			}
	}
}