Run and jump to the left, turning around right before landing on the spikes. Continue holding right, gaining speed to jump out through the door.

Requires:

"Gravity"
{
  "spikeHits": 1
}
"canUseIFrames"
{
  "or": [
    {
      "spikeHits": 2
    },
    "canInsaneJump"
  ]
}

Exit condition:

{
  "leaveWithSidePlatform": {
    "height": 3,
    "runway": {
      "length": 16,
      "openEnd": 0
    },
    "obstruction": [
      1,
      0
    ]
  }
}

Dev note: Max extra run speed $3.3 with spin, or $3.4 with a quick aim-down. This would not be logically valid for gaining blue speed, so we have to be sure it can't be used that way.