Max energy increases with turns

Assets/Battle/BattleController.cs

@@ -6,7 +6,6 @@ public class BattleController : MonoBehaviour
 {
     public HeroId[] heroIds;
     public MonsterId[] monsterIds;
-    public int maxEnergy;
     public CardId[] cardIds;
     
     public HeroInfoUI heroUIPrefab;
@@ -24,6 +23,7 @@ public class BattleController : MonoBehaviour
     private HeroInfoUI[] monsterUIs;
 
     private bool heroTurn;
+    private int maxEnergy;
     private int energy;
 
     void Awake() {
@@ -100,12 +100,18 @@ public class BattleController : MonoBehaviour
 
     private void StartHeroTurn() {
         this.heroTurn = true;
+
         this.energy = this.maxEnergy;
         foreach (BattleHero hero in this.heroes) {
             hero.ResetBlock();
         }
         this.heroDeck.DrawHand();
         this.battlePlayerControls.NotifyHandPileChanged();
+        
+        if (this.maxEnergy < 9) {
+            this.maxEnergy++;
+            this.energy++;
+        }
     }
 
     private void StartEnemyTurn() {

Assets/Battle/BattleScene.unity

@@ -305,7 +305,7 @@ MonoBehaviour:
   m_EditorClassIdentifier: 
   heroIds: 010000000000000002000000
   monsterIds: 000000000100000000000000
-  maxEnergy: 6
+  maxEnergy: 1
   cardIds: 00000000000000000000000000000000000000000100000001000000010000000100000001000000
   heroUIPrefab: {fileID: 6641511084601005557, guid: ef1b469b45cedee418e4c4adf577cd00,
     type: 3}