Fix enemies exploding more than once and misc

Assets/Prefabs/Bullets/ShotgunBullet.prefab

@@ -26,7 +26,7 @@ Transform:
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 6729850174041497321}
   m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
-  m_LocalPosition: {x: -19.990198, y: 7.5981717, z: -12.029297}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_Children: []
   m_Father: {fileID: 0}
@@ -61,5 +61,5 @@ MonoBehaviour:
   m_EditorClassIdentifier: 
   SubBullet: {fileID: 4482402865533696887, guid: 6895e4efeafdc3a4f8f4296856a389fc,
     type: 3}
-  BulletsShot: 5
+  BulletsShot: 8
   TotalArc: 90

Assets/Prefabs/Bullets/ShotgunSubBullet.prefab

@@ -9611,7 +9611,7 @@ MonoBehaviour:
   Sprite: {fileID: 5552990435088311320}
   Trail: {fileID: 4595570391660610945}
   Explosion: {fileID: 6411602551704027216}
-  Damage: 3.7
+  Damage: 2.5
 --- !u!1 &5552990435088311320
 GameObject:
   m_ObjectHideFlags: 0

Assets/Scripts/Effects/Explodable.cs

@@ -14,6 +14,8 @@ namespace Saltosion.OneWeapon.Effects {
         private CameraFX CameraFX;
         private PlayerFun PlayerFun;
 
+        private bool DestroyedAlready = false;
+
         private void Start() {
             foreach (GameObject Obj in BodypartPrefabs) {
                 Rigidbody2D Body = Obj.GetComponent<Rigidbody2D>();
@@ -36,6 +38,16 @@ namespace Saltosion.OneWeapon.Effects {
         }
 
         public void Explode(bool destroyGameObject) {
+            if (destroyGameObject) {
+                // Destroying the object during explosion implies that it can explode only once,
+                // but Destroy() doesn't happen instantly, so here's a guard for that.
+                if (DestroyedAlready) {
+                    return;
+                } else {
+                    DestroyedAlready = true;
+                }
+            }
+
             int Count = (int)(BodypartMinCount + (BodypartMaxCount - BodypartMinCount) * Random.value);
             for (int i = 0; i < Count; i++) {
                 GameObject Obj = BodypartPrefabs[i % BodypartPrefabs.Length];