Here is a simple example of a C# script that can be used in Unity to move a player character in a 2D game using the "AWSD" keys. The script will handle input from the keyboard, and then update the position of the player character accordingly.

using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
    public float speed;

    void Update()
    {
        float moveHorizontal = Input.GetAxis("Horizontal");
        float moveVertical = Input.GetAxis("Vertical");
        
        Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
        transform.position += movement * speed * Time.deltaTime;
    }
}

To use this script, add it to the player character's game object, and assign the appropriate speed value. Input for the "AWSD" keys can be configured in the Unity Input Manager.
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