SpaceFighters Package error with latests versions of unity

I have tested on 2020.3.13f1, exists a problem with the shader but it is easy to fix it:

Go to Vortex/VortexLib and change the Shader.Find from (""Particles/Additive"") to this:

lineRenderer.material = new Material(Shader.Find("Legacy Shaders/Particles/Additive"));

Finally the functions should look like this:

public static void DrawLine(GameObject go ,Transform a, Transform b, Color col, float width){

            LineRenderer lineRenderer = go.GetComponent<LineRenderer>();

            if (lineRenderer ==null){lineRenderer = go.AddComponent<LineRenderer>();}

            lineRenderer.material = new Material(Shader.Find("Legacy Shaders/Particles/Additive"));

            lineRenderer.SetColors(col, col);

            lineRenderer.SetWidth(width,width);

            lineRenderer.SetVertexCount(2);

            LineRenderer lineRenderer_ = go.GetComponent<LineRenderer>();

            lineRenderer_.SetPosition(0, a.position);

            lineRenderer_.SetPosition(1, b.position);

        }

        public static void DrawLine(GameObject go ,Vector3 a, Vector3 b, Color col, float width){

            LineRenderer lineRenderer = go.GetComponent<LineRenderer>();

            if (lineRenderer ==null){lineRenderer = go.AddComponent<LineRenderer>();}

            lineRenderer.material = new Material(Shader.Find("Legacy Shaders/Particles/Additive"));

            lineRenderer.SetColors(col, col);

            lineRenderer.SetWidth(width,width);

            lineRenderer.SetVertexCount(2);

            LineRenderer lineRenderer_ = go.GetComponent<LineRenderer>();

            lineRenderer_.SetPosition(0, a);

            lineRenderer_.SetPosition(1, b);

        }

I also have checked and recommend you to make some changes:

go to Scripts/Lib/SpFLib.cs go to CreateEnemyBullet function and set speedx to -speedx:

public static void CreateEnemyBullet(GameObject spawner, GameObject parent, string type,float speedx,float speedy){//type= basic

            GameObject bullet = Instantiate(Resources.Load("Bullet/"+type+"Bullet"), spawner.transform.position, Quaternion.identity)as GameObject;

            bullet.name=type+"bullet";

            master.setLayer("Enemies",bullet);

            LookAt2D(bullet,GameObject.Find("Player").transform);

            bullet.GetComponent<Rigidbody2D>().AddRelativeForce(new Vector2(-speedx,speedy));

            if(parent!=null){bullet.transform.parent=parent.transform;}

        }

and change these scripts from Update() to FixedUpdate():

Scripts/Camera/Main_Controller.cs

Scripts/Enemies/ (all scripts in this folder)