Leaving with upward momentum is possible in three ways: 1) Most easily, with a momentum-conserving morph against the ceiling through the transition, 2) With a momentum-conserving turnaround through the transition, or 3) Jumping specifically with a extra run speed $5.2 or $5.3 and aiming down through the transition. For the first two methods, avoid backing into the corner at the start of runway; instead press against it and turn around, to put Samus into a better position. An even better position is obtained by backing up an additional 8 to 12 pixels from the runway start (again, pressing forward into the corner, not backing into it), or equivalently, pressing and releasing an angle button 4 to 6 times to arm pump while running.

Requires:

"h_speedJump",
{"or": [
  "canMomentumConservingMorph",
  "canInsaneJump"
]}

Exit condition:

"leaveWithSidePlatform": {
  "height": 3,
  "runway": {
    "length": 38,
    "openEnd": 0
  },
  "obstruction": [3, 0]
}

Dev note: Max extra run speed $6.1. Using the full runway (either backing into the corner or turning around from it), the momentum-conserving morph has a 5-frame window for the jump, and either a 2-frame window or 3-frame window for the morph depending on the jump timing; these windows can be more narrow depending on what is required in the next room. The momentum-conserving turnaround requires a frame-perfect (last-frame) jump and a frame-perfect turnaround. The aim-down method requires specific positioning to ensure Samus barely clears the door ledge with a frame-perfect jump.