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}]
}