First off, thanks Karl for running such an interesting and highly thought out game! The premise and writing made this interesting from start to finish, even once I was out.
As a game I do think this was far too imbalanced towards the parasites. As others have said I read the OP as a warning that Karl as GM may interfere with accounts as part of the psychological horror theme. Never did it occur to me that other players could take control of other's accounts. Once I was out from it happening to me it of course became obvious, but I don't think I'd ever have worked it out. It's just too much of a game change from any mafia I've ever played.
On day 3 I was actually quietly confident for the village. We'd luckily hit Ted (actually fudge as it turns out) and I was in contact with primarily denster with quite a web of roles worked out. Not all were perfect in the end (especially my late reaching out to Errkal - how did you know the no role human role PM so perfectly?) but I was deliberately shielding Denster's identity while feeding back information to him. I felt like we were being really careful so that even if I was killed the circle could succeed.
Unfortunately we had no inkling that my PMs would become compromised, and that must have played right into the parasite's hands. Our careful web of trust was completely broken.
If we'd been aware of the actual rules, I would have played completely differently, and I think that is the main point of imbalance. The parasites didn't modify the wolf role and how the game is played, they flipped a lot of it right on its head. Vote history examination or other regular mafia tactics just become useless, but we as a village had no idea.
I'm amazed that I correctly targeted Cribs on day 1 and hit Ted the day after. Complete stroke of luck

Also I wish soneone had noticed the sudden drop in activity for Delta_Orange once I got took over! But I don't blame anyone, I'd hace never realised either :p