Immediately spark after the door transition into the wall just to the right of the top right door.

Entrance condition:

"comeInShinecharged": {},
"comesThroughToilet": "any"

Requires:

{"shineChargeFrames": 10},
"Gravity",
"canPrepareForNextRoom",
"canHorizontalMidairShinespark",
{"shinespark": {"frames": 70, "excessFrames": 16}}