playerMovement.cs

using System.Collections;
using System.Collections.Generic;
using System.Numerics; // Only if necessary for other parts of the script
using UnityEngine;
using UnityEngine.InputSystem;


public class PlayerMovement : MonoBehaviour
{
    [SerializeField] private float speed;

    [SerializeField] private float rotationSpeed;

    [SerializeField] private float screenBorder;

    private Rigidbody2D rigidbody;
    private UnityEngine.Vector2 movementInput;
    private UnityEngine.Vector2 smoothedMovementInput;
    private UnityEngine.Vector2 movementInputSmoothVelocity;
    private Camera camera;

    private Animator animator;

    private void Awake()
    {
        rigidbody = GetComponent<Rigidbody2D>();
        camera = Camera.main;

        animator = GetComponent<Animator>();
    }

    private void FixedUpdate()
    {
        SetPlayerVelocity();
        RotateInDirectionOfInput();
        SetAnimation();
    }

    private void SetAnimation()
    {
        bool isMoving = movementInput != UnityEngine.Vector2.zero;
        animator.SetBool("isMoving", isMoving);
    }

    private void SetPlayerVelocity()
    {
        smoothedMovementInput = UnityEngine.Vector2.SmoothDamp(smoothedMovementInput, movementInput, ref movementInputSmoothVelocity, 0.1f);
        rigidbody.velocity = smoothedMovementInput * speed;
        PreventPlayerGoingOffScreen();
    }

    private void PreventPlayerGoingOffScreen()
    {
        UnityEngine.Vector2 screenPosition = camera.WorldToScreenPoint(transform.position);

        if ((screenPosition.x < screenBorder && rigidbody.velocity.x < 0) || (screenPosition.x > camera.pixelWidth - screenBorder && rigidbody.velocity.x > 0))
        {
            rigidbody.velocity = new UnityEngine.Vector2(0, rigidbody.velocity.y);

        }
         if ((screenPosition.y < screenBorder && rigidbody.velocity.y < 0) || (screenPosition.y > camera.pixelHeight - screenBorder && rigidbody.velocity.y > 0))
        {
            rigidbody.velocity = new UnityEngine.Vector2(rigidbody.velocity.x, 0);

        }



    }

    private void RotateInDirectionOfInput()
    {
        if (movementInput != UnityEngine.Vector2.zero)
        {
            UnityEngine.Quaternion targetRotation = UnityEngine.Quaternion.LookRotation(transform.forward, smoothedMovementInput);
            UnityEngine.Quaternion rotation = UnityEngine.Quaternion.RotateTowards(transform.rotation, targetRotation, rotationSpeed * Time.deltaTime);

            rigidbody.MoveRotation(rotation);
        }
    }

    private void OnMove(InputValue inputValue)
    {
        movementInput = inputValue.Get<UnityEngine.Vector2>();
    }
}