Kill the Beetoms with Screw Attack or by freezing and using Bombs or Power Bombs.

Requires:

{
  "resetRoom": {
    "nodes": [
      1
    ]
  }
}
{
  "or": [
    {
      "and": [
        "ScrewAttack",
        {
          "cycleFrames": 370
        }
      ]
    },
    {
      "and": [
        "Ice",
        "h_useMorphBombs",
        {
          "cycleFrames": 480
        }
      ]
    },
    {
      "and": [
        "Morph",
        {
          "resourceAvailable": [
            {
              "type": "Energy",
              "count": 50
            }
          ]
        },
        "h_usePowerBomb",
        {
          "cycleFrames": 460
        }
      ]
    }
  ]
}

Farm cycle drops: 3 Beetom

Dev note: Health Bomb ends at 50 energy. One ammo can be used to gain a power bomb and then power bombs can be used to farm more power bombs.