campfire/Assets/Scripts/PauseMenu.cs

using UnityEngine;

[RequireComponent(typeof(CanvasGroup))]
public class PauseMenu : MonoBehaviour {
    public GameState GameState;

    private CanvasGroup Canvas;
    private bool Paused {
        get {
            return GameState.Current == State.Paused;
        }
    }

    private void Awake() {
        Canvas = GetComponent<CanvasGroup>();
        Fade(true);
    }

    private void Update() {
        Fade(false);
    }

    private void Fade(bool instant) {
        Canvas.alpha = Mathf.Lerp(Canvas.alpha, Paused ? 1 : 0, instant ? 1 : 10f * Time.unscaledDeltaTime);
        Canvas.blocksRaycasts = Paused;
    }
}