가로

if(Input.GetKeyDown(KeyCode.Space)){
    for(int i=0; i<3; i++){
        GameObject Bullet = Instantiate(BulletPrefab);
        Vector3 bulletPos = transform.position;
        bulletPos.y += 0.3f * i;
        Bullet.transform.position = bulletPos;
        Bullet.GetComponent<Rigidbody2D>().AddForce(Vector2.up * BulletSpeed);
    }        
}

세로

if(Input.GetKeyDown(KeyCode.Space)){
    for(int i=0; i<3; i++){
        GameObject Bullet = Instantiate(BulletPrefab);
        Vector3 bulletPos = transform.position;
        bulletPos.x -= 0.3f;
        bulletPos.x += 0.3f * i;
        Bullet.transform.position = bulletPos;
        Bullet.GetComponent<Rigidbody2D>().AddForce(Vector2.up * BulletSpeed);
    }
}

부채꼴

if(Input.GetKeyDown(KeyCode.Space)){
    for(int i=0; i<3; i++){
        GameObject Bullet = Instantiate(BulletPrefab);
        Bullet.transform.position = transform.position;
        Vector2 bulletDir = Vector2.up;
        bulletDir.x -= 0.3f;
        bulletDir.x += 0.3f * i;
        Bullet.GetComponent<Rigidbody2D>().AddForce(bulletDir * BulletSpeed);
    }
}