Simple camera shake script in Godot 4.

Camera.cs

using Godot;
using System;

public partial class Camera : Camera2D
{
    public enum ShakeStrengthType
    {
        Low,
        Medium,
        High
    }

    [Export]
    private float _shakeDecay = 0.8f; // How quickly the shaking stops (0-1).

    [Export]
    private Vector2 _shakeOffsetMax = new(100, 75); // Maximum horizontal/vertical shake in pixels.

    [Export]
    private float _shakeStrengthLow = 0.1f; // Max shake strength for low intensity.

    [Export]
    private float _shakeStrengthMed = 0.2f; // Max shake strength for medium intensity.

    [Export]
    private float _shakeStrengthHigh = 0.3f; // Max shake strength for high intensity.

    private float _currentShakeStrength;

    public static Camera Last { get; private set; }

    public override void _EnterTree()
    {
        Last = this;
    }

    public static void ShakeCamera(ShakeStrengthType strengthType)
    {
        Last?.Shake(strengthType);
    }

    public void Shake(ShakeStrengthType strengthType)
    {
        Shake(strengthType switch
        {
            ShakeStrengthType.Medium => _shakeStrengthMed,
            ShakeStrengthType.High => _shakeStrengthHigh,
            _ => _shakeStrengthLow
        });
    }

    public void Shake(float? strength = null)
    {
        strength ??= _shakeStrengthLow;

        _currentShakeStrength = Mathf.Max(_currentShakeStrength, strength.Value);
    }

    public override void _Process(double delta)
    {
        if (_currentShakeStrength <= 0)
            return;

        _currentShakeStrength = Mathf.Max(_currentShakeStrength - _shakeDecay * (float)delta, 0);
        UpdateShake();
    }

    private void UpdateShake()
    {
        float amount = Mathf.Pow(_currentShakeStrength, 2);
        float x = _shakeOffsetMax.X * amount * GD.RandRange(-1, 1);
        float y = _shakeOffsetMax.Y * amount * GD.RandRange(-1, 1);

        Offset = new Vector2(x, y);
    }

    public override void _ExitTree()
    {
        if (Last == this)
            Last = null;
    }
}