C# inheritance

class Entity
{
    public Vec pos, vel, size;
    public Direction direction;

    public Entity(Vec _pos, Vec _size, Direction _direction)
    {
        size = _size;
        pos = _pos;
        vel = _direction.vec;

        direction = _direction;
    }

    public void update()
    {
        pos.add(vel);
    }
}

class Player : Entity
{
    public Vec pos, vel, size;
    public Direction direction;

    public Player(Vec _pos, Vec _size, Direction _direction) : base(_pos, _size, _direction) { }
}