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.