Wait for the Puromis to pass, or use Space Jump or Spring Ball to pass through them safely.

Entrance condition:

"comeInNormally": {}

Requires:

{"haveBlueSuit": {}},
{"or": [
  {"and": [
    "SpaceJump",
    {"heatFrames": 635}
  ]},
  {"and": [
    "h_useSpringBall",
    {"heatFrames": 700},
    {"acidFrames": 40}
  ]},
  {"and": [
    "h_useSpringBall",
    "canSpringFling",
    "canInsaneJump",
    {"heatFrames": 700}
  ]},
  {"and": [
    {"heatFrames": 790},
    {"acidFrames": 80}
  ]}
]}

Unlocks doors:

{
  "types": ["missiles"],
  "requires": [{"heatFrames": 30}]
},
{"types": ["super"], "requires": []},
{
  "types": ["powerbomb"],
  "requires": [{"heatFrames": 60}]
}

Dev note: It is possible to land on the Puromis without taking damage, but it's unclear if this can be done reliably.