Update: if you execute Lone Cube skip fast enough, the game doesn't register you're in Lone Cube at all and when you reset after activating the laser, puts you back into Transfer.

Correction: It's not about how fast, it's about how close you are from the wall when you enter the door on the floor. If you're too close, the game sees you're in Lone Cube, but there's a small window where the game doesn't notice.

Found a skip for lone cube, saves around 22 seconds, will upload a video once I can get some peace and quiet in my room.

Final completion percentage has to be 25% or less when you beat the game, I think