Fake Count - converted prisoners as in they've already reached their total conversion? If so I don't really have any reason to continue upgrading them personally.
There will be an end, but the game is not finished yet so it'll be the next release that puts the ending cinematics and credits and such.
The stats of the creatures is not done yet. This is only a beta that you're playing. So there will be definitely balance changes eventually.
I'll consider your hybrid idea! I also have a suggestions channel in my Discord, that's usually what I use when I'm pulling ideas. Feel free to use it anytime.
Okay, I don't think there's 13, like I don't think there's an odd number. Which means there's probably one other one that you guys are missing on game mode somehow. But this has been out for a year for my patrons and on Steam, and no one else has reported not being able to unlock all of the bad ends (currently in the game). So unless I am mistaken, and there is an odd number, Mars will be able to probably verify all this when he comes back after this weekend.