Bugged to hell...
If you're playing this game, NEVER press the "down" button. It'll screw you. You'll "beam out", and you have no way to return. Fix this, and make the game more exciting, and you've got something awesome on your hands.
And, in the event that you're wondering, I ran into this "Holy crap, I just went away" deal on the level just after I snagged Zero.