The only thing I can rationalize this as is "bugged to hell."
Assuming the switches in both levels that I was able to play indicate the level finisher, then I was unable to get past the third switch as, upon pressing the second switch, the entire level disappears and I'm stuck in limbo for eternity.
I have no clue if this is a problem with my machine or a problem with the game itself, but as it stands I can't give it a score above 0.