123

Without Super Missiles or to save using a Super Missile, jump over the yapping maw to make it try to grab Samus, the Samus Eater can then be entered from the other side avoiding being grabbed.

Requires:

{
  "obstaclesCleared": [
    "A"
  ]
}
"h_spikeSuitThornHitLeniency"
{
  "or": [
    {
      "and": [
        {
          "obstaclesNotCleared": [
            "B"
          ]
        },
        {
          "canShineCharge": {
            "usedTiles": 29,
            "openEnd": 0
          }
        },
        {
          "thornHits": 4
        },
        "canSpikeSuit",
        {
          "shinespark": {
            "frames": 1,
            "excessFrames": 1
          }
        }
      ]
    },
    {
      "and": [
        {
          "obstaclesCleared": [
            "B"
          ]
        },
        "canSamusEaterStandUp",
        {
          "samusEaterCycles": 1
        },
        "h_shinechargeMaxRunway",
        "h_spikeSuitSamusEaterLeniency",
        {
          "thornHits": 1
        },
        "canSpikeSuit",
        {
          "shinespark": {
            "frames": 4,
            "excessFrames": 4
          }
        }
      ]
    }
  ]
}