godot 4, c#, 2.5d player movement

Player.cs

using Godot;
using System;
using System.Reflection;

public partial class Player : CharacterBody3D
{
    private Vector2 direction = Vector2.Zero;
    private float Speed = 10;
    public override void _PhysicsProcess(double delta)
    {
        base._PhysicsProcess(delta);
        // GD.Print("player physics process");
        Velocity = new(direction.X, 0, direction.Y);
        Velocity *= 5;
        MoveAndSlide();
    }

    public override void _Input(InputEvent @event)
    {
        base._Input(@event);
        direction = Input.GetVector("MoveLeft", "MoveRight", "MoveForward", "MoveBackward");
    }
}