Teleport at quarter speed in the current build.
Immediate Y-axis teleports, up or down, are separate moves. Each adds a jump. ↑ / ↓ before the number set the direction for one jump (sheet 09). Y is step 2 of the dimension ladder (sheet 08).
No gravity or flight-path collision calculation in the first vertical version.
Begin with teleportation. Whether to embrace it or animate movement is open.