Player Gets Stuck On TilemapCollider2D

Hey, I'm new to game development in Unity.

I wanted to make a 2d platformer with basic movement and the environment drawn with a tile palette but my player always gets stuck on the single box colliders of the tilemap collider. I would appreciate any help :)

Here's my code if it helps:

 public class PlayerMovement : MonoBehaviour
 {
     [SerializeField] GameObject player;
     [SerializeField] LayerMask groundLayermask;
 
     private Movement movement;
     private Rigidbody2D rigidBody;
     private BoxCollider2D boxCollider;
 
     void Start()
     {
         movement = GetComponent<Movement>();
         rigidBody = player.GetComponent<Rigidbody2D>();
         boxCollider = player.GetComponent<BoxCollider2D>();
     }
 
     void Update()
     {
         player.transform.eulerAngles = new Vector3(0, 0, 0);
 
         if (Input.GetKeyDown(KeyCode.Space) && IsGrounded()) {
             rigidBody.AddForce(player.transform.up * movement.jump, ForceMode2D.Impulse);
         }
     }
 
     void FixedUpdate() {
         if (Input.GetKey(KeyCode.D)) {
             player.transform.position += player.transform.right * movement.speed * Time.deltaTime;
         }
         if (Input.GetKey(KeyCode.A)) {
             player.transform.position -= player.transform.right * movement.speed * Time.deltaTime;
         }
     }
 
     private bool IsGrounded() {
         float extraHeightTest = 0.02f;
         RaycastHit2D raycastHit = Physics2D.BoxCast(boxCollider.bounds.center, boxCollider.bounds.size, 0f, Vector2.down, extraHeightTest, groundLayermask);
         if (raycastHit.collider != null)
         {
             Debug.Log(raycastHit.collider);
         }
         return raycastHit.collider != null;
     }
 }