12

Do not kill all three Metroids, or else they cannot be farmed again, leaving only Crystal Flash as an option. Shinecharge at the long tunnel near the left door, then use a Rinka or the acid to interrupt.

Requires:

{
  "obstaclesCleared": [
    "R-Mode"
  ]
}
{
  "or": [
    "h_CrystalFlashForReserveEnergy",
    {
      "and": [
        "canRiskPermanentLossOfAccess",
        {
          "not": "f_KilledMetroidRoom3"
        },
        "h_RModeCanRefillReserves",
        "Ice",
        {
          "enemyKill": {
            "enemies": [
              [
                "Metroid"
              ],
              [
                "Metroid"
              ]
            ],
            "explicitWeapons": [
              "Missile",
              "Super"
            ]
          }
        },
        {
          "partialRefill": {
            "type": "ReserveEnergy",
            "limit": 20
          }
        }
      ]
    }
  ]
}
{
  "or": [
    {
      "or": [
        "f_KilledMetroidRoom3",
        {
          "obstaclesCleared": [
            "f_KilledMetroidRoom3"
          ]
        }
      ]
    },
    "Ice",
    "canMetroidAvoid"
  ]
}
{
  "canShineCharge": {
    "usedTiles": 29,
    "openEnd": 2
  }
}
{
  "autoReserveTrigger": {
    "maxReserveEnergy": 95
  }
}
"canRModeSparkInterrupt"

Resets obstacles: R-Mode