There's something wrong that's starting to happen quite regularly now. This is how it happened. WARNING. THIS WILL DELETE YOUR GAME SAVE. IT WILL NOT DELETE YOUR SECRET LAB RECORDS.
1. Go on Vertex Vortex.
2. Turn on Invincibility.
3. Get to the end with the crewmate.
4. Go to the bottom left corner, and flip.
5. You should be on a small, invisible platform. Move to the left of the edge, then when falling off, you must move back into the platform. You'll know you've done it right if you start auto-flipping in the same spot.
6. Save and leave.
Instead of arriving at the menu, you'll be in the main VVVVVV overworld. But the top screen will be black and the music will mute like when you're in a musicless area (i.e. You can hear the flip sound effect louder). You can see the map and when you are though. You won't be able the in-game menu, but if you head for a teleporter it will autosave, and you can close the game, launch it up and click continue game. If you do this, you'll be back but you can see the screen, music will play, and the menu will pop up when prompted. It will say you have rescued no crewmates, you'll have the amount of trinkets you collected on Vertex Vortex, and 0 deaths. If you go to the ship, no one will be there, the trinket room will be empty, and the jukebox room will be full.
Anyone know why? Also, please post trinket guide for Vertex Vortex.
EDIT: This method may or may not work. There may be multiple methods or it's just random bad luck. Also, I am not asking for it to be fixed. Just telling people about it.