Thanks! I ended up doing using this code in case anyone needs it, thanks again
using UnityEngine;
using System.Collections;
public class NewBehaviourScript : MonoBehaviour {
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update()
{
if(Input.GetKeyDown(KeyCode.Space))
{
Physics2D.gravity *= -1;
}
}
}