First danmakufu script - Remilia's last spell [updated]

#BGM ["./bgm/EoSD Remilias Theme- Septette for the Dead Princess (Re-Extended).mp3"]
#include "script/default_system/Default_ShotConst.txt"
#include "./Cutin.txt"
#include "./ExplosionEffect.txt"

let objBoss;
let objScene = GetEnemyBossSceneObjectID();
let objBullet;
let objPlasma;
let shot_sound = GetCurrentScriptDirectory ~ "se_charm.wav";
let spell_sound = GetCurrentScriptDirectory ~ "se_UseSpell.wav";
let explosion = GetCurrentScriptDirectory ~ "se_explosion.wav"

//Default dimension of Danmakufu's playing field is 384 * 448 pixels.

@Event
{
	alternative(GetEventType())
	case(EV_REQUEST_LIFE){
		SetScriptResult(10000);
	}
	case(EV_REQUEST_TIMER){
		SetScriptResult(120);
	}
	case(EV_REQUEST_SPELL_SCORE){
		SetScriptResult(6000000);
	}
}

@Initialize
{
	objBoss = ObjEnemy_Create(OBJ_ENEMY_BOSS);
	ObjEnemy_Regist(objBoss);
	let imgRemilia = GetCurrentScriptDirectory ~ "Remilia.png";
	ObjPrim_SetTexture(objBoss, imgRemilia);
	ObjSprite2D_SetSourceRect(objBoss, 75, 0, 138, 80);
	ObjSprite2D_SetDestCenter(objBoss);
	ObjMove_SetDestAtFrame(objBoss, 90, 60, 60);
	StartSpell;

	LoadSound(shot_sound);
	LoadSound(spell_sound);
	LoadSound(explosion);

	ObjEnemyBossScene_StartSpell(objScene);

	TDrawLoop;
	TFinalize;
	MainTask;
}

task TDrawLoop
{
	let imgRemilia = GetCurrentScriptDirectory ~ "Remilia.png";
	ObjPrim_SetTexture(objBoss, imgRemilia);
	ObjSprite2D_SetSourceRect(objBoss, 75, 0, 138, 80);
	ObjSprite2D_SetDestCenter(objBoss);
}

task MainTask
{
	Movement;
	PlaySE(spell_sound);
	wait(120);
	while(ObjEnemy_GetInfo(objBoss,INFO_LIFE)>0)
	{
		let angleT = 0;
		let angleX = 0;
		let objcount = 0;
		let objregard = 0;
		loop
		{
			loop(6)
			{
				objPlasma = CreateShotA1(ObjMove_GetX(objBoss), ObjMove_GetY(objBoss), 3, angleT, DS_BALL_L_PURPLE, 30);
				objBullet = CreateShotA1(ObjMove_GetX(objBoss), ObjMove_GetY(objBoss), 3, angleX, DS_BALL_L_RED, 30);
				PlaySE(shot_sound);
				angleT+=360/6;
				angleX+=360/6;
				BulletChange;
	  		}
			angleT+=objcount;
			angleX+=objregard;
			objcount+=1;
			objregard-=1;
			wait(25);
		}
	}
}

task Movement
{
	while(ObjEnemy_GetInfo(objBoss,INFO_LIFE)>0)
	{
		ObjMove_SetDestAtFrame(objBoss, rand(GetCenterX+90,GetCenterX-90), rand(GetCenterY-60,GetCenterY-120), 60);
		wait(180);
        }
}

task BulletChange
{
	ObjMove_SetAngularVelocity(objBullet, 0.3);
	ObjMove_SetAngularVelocity(objPlasma, -0.3);
	wait(10);
}

task StartSpell
{
	loop(2){yield;}
	let sekibanki = GetCurrentScriptDirectory ~ "Remilia Cutin.png";
	ObjCutin_SetSpellcardS4("\"Remilia's Netherworld\"", sekibanki, MOKOU, 240, 104, 104);
	ObjCutin_LaunchS3(BYAKUREN, sekibanki, "Normal");
}

task TFinalize
{
	while(ObjEnemy_GetInfo(objBoss,INFO_LIFE)>0){yield;}
	Explosion(objBoss);
	loop(1)
	{
		wait(300);
		Obj_Delete(objBoss);
		DeleteShotAll(TYPE_ALL,TYPE_ITEM);
		SetAutoDeleteObject(true);
		CloseScript(GetOwnScriptID());
	}
}
@MainLoop
{
        ObjEnemy_SetIntersectionCircleToShot(objBoss, ObjMove_GetX(objBoss), ObjMove_GetY(objBoss), 32);
        ObjEnemy_SetIntersectionCircleToPlayer(objBoss, ObjMove_GetX(objBoss), ObjMove_GetY(objBoss), 24);
	ObjEnemy_SetDamageRate(objBoss, 100, 0);
        yield;
}

function GetCenterX
{
	return GetStgFrameWidth/2;
}
function GetCenterY
{
	return GetStgFrameHeight/2;
}
function wait(n)
{
	loop(n){yield;}
}