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Game Development

Fly Pickup only works for limited time

My fly pickup only works for about 5 seconds. After that, the flies won't disappear and score won't increase.

My code for FlyPickup.cs:

using UnityEngine; using System.Collections;

public class FlyPickup : MonoBehaviour {

private GameObject pickupPrefab;

void Start(){

}

void OnTriggerEnter(Collider other){

    // if coliider other is tagged with the player... 
    if (other.CompareTag("Player")){
        pickupPrefab = GameObject.Find("FlyParticles");
        // add the pickup particles
        Instantiate(pickupPrefab, transform.position, Quaternion.identity);

        // decrement the total number of flies
        FlySpawner.totalFlies--;

        // update the score
        ScoreCounter.score++;

        Destroy(gameObject);
    }
}

}