Spark vertically by the first plant on the right to hit the floating island.

Entrance condition:

{
  "comeInShinecharged": {},
  "comesThroughToilet": "yes"
}

Requires:

{
  "shineChargeFrames": 60
}
"h_navigateUnderwater"
"canShinechargeMovement"
{
  "shinespark": {
    "frames": 14,
    "excessFrames": 4
  }
}

Dev note: It is possible to spark diagonally from the door and hit the island, requiring fewer frames remaining, but it's starting position is somewhat precise and uses a bit more energy.