Character moves slower after build

So i am working on the Ruby2D tutorial, and everything goes fine, up until I decide to play the newly built game.
When I try to move my character, it goes extremely slow. This problem however only appears in the build. When i play the Scene everything works well. Changing the speed only has effect in the Scene.
My current controller script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class RubyController : MonoBehaviour
 {
     public int maxHealth = 5;
 
     public int health { get { return currentHealth; } }
 
     int currentHealth;
 
     public float speed = 13.0f;
 
     public ParticleSystem healthEffect;
     public ParticleSystem damageEffect;
 
     public float timeInvincible = 2.0f;
     bool isInvincible;
     float invincibleTimer;
 
     Rigidbody2D rigidbody2d;
     Animator animator;
     Vector2 lookDirection = new Vector2(1, 0);
     public GameObject projectilePrefab;
 
     AudioSource audioSource;
     public AudioClip shotClip;
     
     void Start()
     {
         rigidbody2d = GetComponent<Rigidbody2D>();
         animator = GetComponent<Animator>();
         currentHealth = maxHealth;
 
         audioSource = GetComponent<AudioSource>();
     }
 
     
     void Update()
     {
         float horizontal = Input.GetAxis("Horizontal");
         float vertical = Input.GetAxis("Vertical");
 
         Vector2 move = new Vector2(horizontal, vertical);
 
         if (!Mathf.Approximately(move.x,0.0f) || !Mathf.Approximately(move.y, 0.0f))
         {
             lookDirection.Set(move.x, move.y);
             lookDirection.Normalize();
         }
 
         animator.SetFloat("Look X", lookDirection.x);
         animator.SetFloat("Look Y", lookDirection.y);
         animator.SetFloat("Speed", move.magnitude);
 
         Vector2 position = rigidbody2d.position;
 
         position = position + move * speed * Time.deltaTime;
 
         rigidbody2d.MovePosition(position);
 
         if (isInvincible)
         {
             invincibleTimer -= Time.deltaTime;
             if (invincibleTimer < 0)
                 isInvincible = false;
         }
         if (Input.GetKeyDown(KeyCode.C))
         {
             Launch();
         }
 
         if(Input.GetKeyDown(KeyCode.X))
         {
             RaycastHit2D hit = Physics2D.Raycast(rigidbody2d.position + Vector2.up * 0.2f, lookDirection, 1.5f, LayerMask.GetMask("NPC"));
             if (hit.collider != null)
             {
                 NonPlayerCharacter character = hit.collider.GetComponent<NonPlayerCharacter>();
                 if (character != null)
                 {
                     character.DisplayDialog();
                 }
                 
             }
         }
     }
 
     public void ChangeHealth(int amount)
     {
         if (amount < 0)
         {
             if (isInvincible)
                 return;
 
             ParticleSystem damaged = Instantiate(damageEffect, rigidbody2d.position + Vector2.up * 0.5f, Quaternion.identity);
             damaged.Play();
 
             isInvincible = true;
             invincibleTimer = timeInvincible;
         }
         else if (amount > 0)
         {
             ParticleSystem healed = Instantiate(healthEffect, rigidbody2d.position + Vector2.up * 0.5f, Quaternion.identity);
             healed.Play();
         }
 
         currentHealth = Mathf.Clamp(currentHealth + amount, 0, maxHealth);
         UIHealthBar.instance.SetValue(currentHealth / (float)maxHealth);
     }
 
     void Launch()
     {
         GameObject projectileObject = Instantiate(projectilePrefab, rigidbody2d.position + Vector2.up * 0.5f, Quaternion.identity);
 
         Projectile projectile = projectileObject.GetComponent<Projectile>();
         projectile.Launch(lookDirection, 300);
 
         animator.SetTrigger("Launch");
 
         PlaySound(shotClip);
     }
 
     public void PlaySound(AudioClip clip)
     {
         audioSource.PlayOneShot(clip);
     }
 }