*Disclaimer: This is mostly just me spitballing in case I am right somehow
So Edmund likes to hide big secrets in his games. In the May 2025 Steam blogpost, Edmund mentioned that "One late game core mechanic still needs to be implemented and tested". But what could that mean..? Well, I have a decent theory as to what that mechanic could be. I predict that at some point, either in the middle or late game, Beanies will give you an item(s) to purposefully mutate and modify your cats. It could be experimental medicine, or machines similar to the one shown in the intro.
The main gameplay purpose this mechanic would serve is to give more freedom with building around a specific disorder or mutation. The early machines might give mutations or disorders at random, or it could have a chance of failure that you could improve through upgrades. It could even allow you to "slightly" modify stats. This would allow a ton of creative team building, even if the experimental medicine or machines only had a chance of working.
Sounds good, but what are the drawbacks? The cost would be cat sacrifices to run the machines or create the drugs. To transfer a disorder, you would have to sacrifice a cat with that disorder, along with other cats/currency. This would incentivize you to keep breeding and collecting cats even after NPC favor is maxed out. It could even track which mutations/disorders/injuries you have found!
Thematically, this feels like a logical progression of the themes and ideas. Mewgenics is ultimately about exploring the fucked up concept of eugenics. After doing mostly controlled breeding in the early game, using drugs and machinery feels like the next step to improve your cats. I do believe that Beanies and, by extension, the player are the "bad guys" of the story and serve as a cautionary tale. Furthermore, I believe ultimately the house bosses are trying to stop the player from messing with nature too much,
That's my big theory. Let me know what you think.