simpler player energy management

game/Assets/Prefabs/Player.prefab

@@ -998,15 +998,15 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 7e52d9351376b9245b9e7a5696aa1fb6, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  powerLevel: 8
-  movementDegenRate: 0.05
-  bulletDegenRate: 0.1
+  powerLevel: 12
+  movementDegenRate: 0.01
+  bulletDegenRate: 0.07
   startSpeed: 5
   lookSmoothingSeconds: 0.05
   cameraSmoothingSeconds: 1
   bulletUpBias: 0.1
   bulletForce: 20
-  powerLevelMax: 100
+  powerLevelMax: 20
   gunTransform: {fileID: 4475041197474250}
   bulletPrefab: {fileID: 54626927522511238, guid: 3c7966951ee835c45be4199d01da6b8d,
     type: 2}