Requires:

"Gravity"
{
  "or": [
    {
      "canShineCharge": {
        "usedTiles": 20,
        "openEnd": 2
      }
    },
    {
      "and": [
        "canEnemyExtendRunway",
        {
          "canShineCharge": {
            "usedTiles": 21,
            "openEnd": 2
          }
        }
      ]
    }
  ]
}
{
  "shinespark": {
    "frames": 25
  }
}

Dev note: It is possible, although not overly useful, to extend the runway here using a snail. FIXME: It is possible to use a snail here and in Shaktool's room to extend the runway at the door. This can be useful when short charging, but can not be used to leave running, as running on the snail does not work.