12

Run right-to-left to gain a shinecharge on the upper right ledge. Use a gravity jump, Space Jump, or HiJump to approach the door above and spark out.

Requires:

"Gravity",
{"or": [
  "SpaceJump",
  "canGravityJump",
  {"and": [
    "HiJump",
    {"or": [
      "canWallJump",
      "canTrickyDashJump"
    ]}
  ]}
]},
{"canShineCharge": {
  "usedTiles": 20,
  "gentleUpTiles": 3,
  "gentleDownTiles": 1,
  "steepUpTiles": 1,
  "openEnd": 0
}},
"canShinechargeMovementComplex",
{"shinespark": {"frames": 8, "excessFrames": 0}}

Exit condition:

"leaveWithSpark": {}

Unlocks doors:

{"types": ["ammo"], "requires": []}

Dev note: With some of these methods it is technically possible (but harder) to reach the door transition with a few frames remaining.