Shake on any camera2D in Godot.

CameraShake.cs

using Godot;
using System;

public class Camera : Camera2D
{
    private RandomNumberGenerator Rng = new RandomNumberGenerator();
    public bool Shaking = false;
    public float Amount;
    public Timer _Timer;

    public override void _PhysicsProcess(float delta)
    {
        if (Shaking)
        {
            Rng.Randomize(); // Randomizing seed
            float x = Rng.RandfRange(-Amount, Amount);

            Rng.Randomize(); // Randomizing seed again
            float y = Rng.RandfRange(-Amount, Amount);

            Offset = new Vector2(x, y);
        }
    }
    /// <summary>
    /// Shake the camera
    /// </summary>
    /// <param name="amount">Force of the shaking</param>
    /// <param name="time">Duration of the shaking</param>
    public void Shake(float amount, float time)
    {
        // Stopping current one if it is already shaking.
        if (Shaking)
            StopShaking();

        // Adding new timer
        var Timer = new Timer();
        AddChild(Timer);

        Timer.WaitTime = time;
        Timer.Connect("timeout", this, "StopShaking");
        Timer.Start();

        Amount = amount;
        _Timer = Timer;
        Shaking = true; // SetShaking loop process

        LimitLeft -= Mathf.CeilToInt(Amount);
        LimitRight += Mathf.CeilToInt(Amount);
        LimitTop -= Mathf.CeilToInt(Amount);
        LimitBottom += Mathf.CeilToInt(Amount);
    }
    /// <summary>
    /// Stop the shaking if the camera is currently shaking
    /// </summary>
    public void StopShaking()
    {
        if (!Shaking)
            return;

        _Timer.Stop();
        _Timer.QueueFree();

        Shaking = false;
        Offset = new Vector2(0, 0);

        LimitLeft += Mathf.CeilToInt(Amount);
        LimitRight -= Mathf.CeilToInt(Amount);
        LimitTop += Mathf.CeilToInt(Amount);
        LimitBottom -= Mathf.CeilToInt(Amount);
    }
}