As soon as you said pre-recorded ghost data I immediately knew where this was going...
That sounds like a nightmare! I would be slightly upset with the play-testers even though I knew they're right! I'm glad you were able to get everything recorded in time. 50 ghosts is a lot to record during a short game jam, especially at the end, I would go crazy!
Also, it was worth it, the recorded ghosts system is my favorite individual game mechanic I've seen in the jam so far, it's so fun to just pick out an individual and watch what happens to them!