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통제된 시연

public bool TryAddTime(float seconds)
{
    if (CurrentState != GameState.Playing || seconds <= 0f)
    {
        return false;
    }

    timeRemaining = Mathf.Min(
        timeRemaining + seconds,
        roundDuration
    );
    UpdateHud();
    return true;
}

using UnityEngine;

public class TimeBonus : MonoBehaviour
{
    [SerializeField] private GameManager gameManager;
    [SerializeField, Min(0.1f)] private float bonusSeconds = 5f;

    private bool collected;

    private void OnTriggerEnter2D(Collider2D other)
    {
        if (collected || !other.CompareTag("Player") || gameManager == null)
        {
            return;
        }

        if (!gameManager.TryAddTime(bonusSeconds))
        {
            return;
        }

        collected = true;
        gameObject.SetActive(false);
    }
}