Char shots oneside only / kills enemy on specific place.

Problem No.1 : I made this code on my computer and when i putted the code on another with the same code (the same game) it shots only to right side.

Problem No.2 : Also when i shot the enemy it kills it only on a specific place, i mean on a specific spot( when the bullet hits him on the center of him).

What i am doing wrong ?

Script UserControl: using UnityEngine; using UnityEngine.UI;

     [RequireComponent(typeof (PlatformerCharacter2D))]
     public class Platformer2DUserControl : MonoBehaviour
     {
         public GameObject bulletDrop;
         
         private enum Side { left, right };
         private Side side = Side.right;
 
         private PlatformerCharacter2D character;
         private bool jump;
 
         private GameManager gameManager;
         private int newScoreValue;
         private int newVitalityValue;
 
         private void Awake()
         {
             character = GetComponent<PlatformerCharacter2D>();
 
             GameObject gameManagerObject = GameObject.FindWithTag("GameManager");
             if (gameManagerObject != null) {
                 gameManager =gameManagerObject.GetComponent<GameManager>();
             }
             if (gameManager == null) {
                 Debug.Log("cant Find gameManager Script" );
             }
         }
 
         private void Update()
         {
             if(!jump)
                 // Read the jump input in Update so button presses aren't missed.
                   jump = Input.GetButtonDown("Jump");
 
             if (Input.GetButtonDown ("Fire1")) {
                 Quaternion rot;
             if(side == Side.right) rot = Quaternion.identity;
                 else rot = Quaternion.Euler(new Vector3(0,0,180));
                 Instantiate (bulletDrop, transform.position, rot);
             }
             
             Vector3 myPos = transform.position;
             foreach (GameObject coin in GameObject.FindGameObjectsWithTag("coinDrop")) {
                 Vector3 coinPos = coin.transform.position;
                 if((coinPos-myPos).magnitude < 1.0) {
                     Destroy (coin);
                     Debug.Log("+1 coin collected");
                     newScoreValue = 50;
                     gameManager.CalculateScore (newScoreValue);
                 }
             }
             
             GameObject[] enemies = GameObject.FindGameObjectsWithTag ("enemy");
             foreach (GameObject enemy in enemies) {
                 Vector3 diff = enemy.transform.position - transform.position;
                 if (diff.magnitude < 1.8) {
                 if(gameManager.vitality > 0){
                         Debug.Log ("you've lost 1 life");
                         Destroy(enemy);
                         newVitalityValue = -1;
                         gameManager.CalculateVitality(newVitalityValue);
                 }
                 }
             }
         }
 
         private void FixedUpdate()
         {
             // Read the inputs.
             //bool crouch = Input.GetKey(KeyCode.LeftControl);
             float h = Input.GetAxis("Horizontal");
             // Pass all parameters to the character control script.
             character.Move(h, jump);
             jump = false;
         }
     }
 

Script BulletBehavior:

using System.Collections;

public class BulletDropBehavior : MonoBehaviour {

 public float speed = 500.0f;

 private GameManager gameManager;
 private int newValue;
 

 void Start () {
     GameObject gameManagerObject = GameObject.FindWithTag("GameManager");
     if (gameManagerObject != null) {
         gameManager =gameManagerObject.GetComponent<GameManager>();
     }
     if (gameManager == null) {
         Debug.Log("cant Find gameManager Script" );
     }
     
 }

 void Update () {
     
     transform.Translate (speed * Time.deltaTime, 0, 0);
     if (transform.position.x > 3.0f)
         Destroy (gameObject);
     GameObject[] enemies = GameObject.FindGameObjectsWithTag ("enemy");
     foreach (GameObject enemy in enemies) {
         Vector3 diff = enemy.transform.position - transform.position;
         if(diff.magnitude < 0.3) {
             Destroy (enemy);
             Destroy (gameObject);
             Debug.Log("+1 enemy killed");
             newValue = 150;
             gameManager.CalculateScore (newValue);
         }
     }
 }

}