improved tambourine behavior

also worked a bit on level balancing, adding background details

Assets/Prefabs/CaveOctopus.prefab

@@ -45,7 +45,7 @@ GameObject:
   - component: {fileID: 1214578695954916569}
   m_Layer: 0
   m_Name: CaveOctopus
-  m_TagString: Enemy
+  m_TagString: ProjectileEnemy
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0
   m_StaticEditorFlags: 0

Assets/Prefabs/DEBUG/PersistantData/DebugCanvas.prefab

@@ -667,7 +667,7 @@ RectTransform:
   m_AnchorMin: {x: 0.5, y: 0.5}
   m_AnchorMax: {x: 0.5, y: 0.5}
   m_AnchoredPosition: {x: 0, y: 0}
-  m_SizeDelta: {x: 160, y: 30}
+  m_SizeDelta: {x: 300, y: 30}
   m_Pivot: {x: 0.5, y: 0.5}
 --- !u!222 &6246326073037474307
 CanvasRenderer:
@@ -825,7 +825,7 @@ GameObject:
   - component: {fileID: 2527389465697474493}
   m_Layer: 5
   m_Name: DebugCanvas
-  m_TagString: DebugCanvas
+  m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0
   m_StaticEditorFlags: 0
@@ -844,7 +844,7 @@ RectTransform:
   m_Children:
   - {fileID: 7749526488533549851}
   m_Father: {fileID: 0}
-  m_RootOrder: 0
+  m_RootOrder: 4
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
   m_AnchorMin: {x: 0, y: 0}
   m_AnchorMax: {x: 0, y: 0}