12

The gate's button is aligned with the the base of the rightmost slope. The Fune will shoot a fireball over the platform near the gate, which can be difficult to avoid.

Requires:

{
  "canShineCharge": {
    "usedTiles": 28,
    "gentleUpTiles": 3,
    "gentleDownTiles": 3,
    "openEnd": 0
  }
}
{
  "shinespark": {
    "frames": 24,
    "excessFrames": 8
  }
}
{
  "heatFrames": 300
}
{
  "or": [
    {
      "and": [
        "canShinechargeMovementTricky",
        "canHeroShot"
      ]
    },
    {
      "heatFrames": 100
    }
  ]
}
{
  "or": [
    "canTrickyJump",
    {
      "enemyDamage": {
        "enemy": "Fune",
        "type": "fireball",
        "hits": 1
      }
    }
  ]
}

Clears obstacles: A