Basic path finding in godot 3.1 using C# & Navigation2D node

GodotPathFinding.cs

using System.Linq;
using Godot;
using Godot.Collections;

namespace Gamma.Core.Scripts
{
    public class Arena : Node2D
    {
        private int Speed = 300;
        private bool moveNode = false;
        private Navigation2D _navigation2D;
        private Vector2[] _paths = new Vector2[]{};
        private Node2D _char;

        public override void _Ready()
        {
            _char = GetNode<Node2D>("Enemy");
            _navigation2D = GetNode<Navigation2D>("Navigation2D");
        }

        public override void _Input(InputEvent @event)
        {
            if(Input.IsMouseButtonPressed((int) ButtonList.Left))
            {
                moveNode = true;
                UpdateNavigationPath(_char.Position, GetLocalMousePosition());
            }
        }

        public override void _Process(float delta)
        {
            if(moveNode)
            {
                MoveCharacter(Speed * delta);
            }
        }

        private void UpdateNavigationPath(Vector2 start, Vector2 end)
        {
            _paths = _navigation2D.GetSimplePath(start, end);
            _paths = _paths.Skip(1).Take(_paths.Length - 1).ToArray();
        }

        private void MoveCharacter(float speed)
        {
            var lastPosition = _char.Position;
            for(var x = 0; x < _paths.Length; x++)
            {
                var distanceBetweenPoints = lastPosition.DistanceTo(_paths[x]);
                if(speed <= distanceBetweenPoints)
                {
                    _char.Position = lastPosition.LinearInterpolate(_paths[x], speed / distanceBetweenPoints);
                    break;
                }
                
                if (speed < 0.0) 
                {
                    _char.Position = _paths[0];
                    moveNode = false;
                    break;
                }

                speed -= distanceBetweenPoints;
                lastPosition = _paths[x];
                _paths = _paths.Skip(1).Take(_paths.Length - 1).ToArray();
            }
        }
    }
}

Is this C#?

Yes