Use the Solid Blocks next to the Samus Eater to clip up through the Power Bomb Blocks. Carefully jump around the thorns, use HiJump to jump over them, or walk through them using IFrames.

Requires:

"canCeilingClip"
"canPartialFloorClip"
{
  "or": [
    {
      "and": [
        "canCarefulJump",
        "HiJump",
        "canTwoTileSqueeze",
        {
          "or": [
            "canTrickyJump",
            {
              "thornHits": 1
            }
          ]
        }
      ]
    },
    {
      "and": [
        "canNeutralDamageBoost",
        "canIframeSpikeJump",
        {
          "thornHits": 1
        }
      ]
    },
    {
      "and": [
        "canPreciseWalljump",
        "canTwoTileSqueeze"
      ]
    }
  ]
}