Test

.gitignore

@@ -5,8 +5,6 @@
 /[Ll]ibrary/
 /[Tt]emp/
 /[Oo]bj/
-/[Bb]uild/
-/[Bb]uilds/
 /[Ll]ogs/
 /[Uu]ser[Ss]ettings/
 

Assets/BSTNodePrefab.prefab

@@ -147,6 +147,7 @@ GameObject:
   - component: {fileID: 2372196576948107384}
   - component: {fileID: 430214222340186483}
   - component: {fileID: 3899948215734151422}
+  - component: {fileID: 8186261260788888114}
   m_Layer: 0
   m_Name: BSTNodePrefab
   m_TagString: Untagged
@@ -237,3 +238,42 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 3fdd0ffd770c0b843ba69a4f7aba89ff, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
+  isInvasive: 0
+  normalColor: {r: 1, g: 1, b: 1, a: 1}
+  invasiveColor: {r: 1, g: 0, b: 0, a: 1}
+--- !u!58 &8186261260788888114
+CircleCollider2D:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 7318434673616142976}
+  m_Enabled: 1
+  serializedVersion: 3
+  m_Density: 1
+  m_Material: {fileID: 0}
+  m_IncludeLayers:
+    serializedVersion: 2
+    m_Bits: 0
+  m_ExcludeLayers:
+    serializedVersion: 2
+    m_Bits: 0
+  m_LayerOverridePriority: 0
+  m_ForceSendLayers:
+    serializedVersion: 2
+    m_Bits: 4294967295
+  m_ForceReceiveLayers:
+    serializedVersion: 2
+    m_Bits: 4294967295
+  m_ContactCaptureLayers:
+    serializedVersion: 2
+    m_Bits: 4294967295
+  m_CallbackLayers:
+    serializedVersion: 2
+    m_Bits: 4294967295
+  m_IsTrigger: 0
+  m_UsedByEffector: 0
+  m_CompositeOperation: 0
+  m_CompositeOrder: 0
+  m_Offset: {x: 0, y: 0}
+  m_Radius: 0.5

Assets/Border.physicsMaterial2D

@@ -0,0 +1,14 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!62 &6200000
+PhysicsMaterial2D:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: Border
+  serializedVersion: 2
+  friction: 0
+  bounciness: 0
+  m_FrictionCombine: 1
+  m_BounceCombine: 4