FlyingFred/Assets/CharacterController.cs

using UnityEngine;

public class CharacterController : MonoBehaviour
{
    public Rigidbody2D characterRigidbody;
    public float swingForce = 10f;

    void Update()
    {
        // Control the character with horizontal input
        float input = Input.GetAxis("Horizontal");
        characterRigidbody.AddForce(Vector2.right * input * swingForce);
    }
}