I agree, great idea
But poorly implemented. I just tried to look at it, and the ghosts all stayed inside, until Pacman was able to make his way straight to his goal. As soon as he turned the ghosts blue, they departed the "ghost pen" and actually started heading toward pacman. No matter how many times they were put back in, out they came. Why are they in such a hurry to die, but don't care about pacman otherwise?
That is poor design. I'm not playing until the ghosts have at least half the intelligence of pacman