If Samus falls into the lava without Gravity, escape by spin jumping rather than jumping straight up. Also note that the spikes' hitbox is one tile higher than it appears.

Requires:

{
  "haveBlueSuit": {}
}
"canCrumbleJump"
{
  "heatFrames": 1780
}
{
  "or": [
    "canInsaneJump",
    {
      "and": [
        {
          "enemyDamage": {
            "enemy": "Metaree",
            "type": "contact",
            "hits": 1
          }
        },
        {
          "heatFrames": 350
        },
        {
          "lavaFrames": 60
        }
      ]
    }
  ]
}

Clears obstacles: A

Unlocks doors:

{"types":["missiles"],"requires":[{"heatFrames":20}]}