This feels kind of... Unfinished. Like, the game ends just as you're getting into the groove of playing. Maybe I missed something, though? The game said I'd seen everything after I merged the Baron, but then there was another scene after that regarding the concern of the Witchfinders, so I don't know whether that was "really" the end or if it was just something left from before the update. But otherwise, well, it ends just about the same time that you've just made a few good servants, decided what transformations you want for yourself, and are ready to start playing more seriously.
I also feel like the game had some issues with the core gameplay loop. You're given a fairly limited number of people you can keep, but your only option for the day is to go out and meet someone new; you can replace someone you already have, but it will only take a few days before you're trading out seven-upgrade people for eight-upgrade people, a pretty marginal improvement. This is exacerbated by the fact that you can only transform one aspect of one person at a time, regardless of how skilled your apprentices are, meaning that you're spending multiple days improving your servants, guaranteeing that you're "wasting" days hunting people that you can't actually do anything with while you wait for time to pass.
It's also a pity that you can't do anything with your apprentices - they're just there, untouchable unless you decide to use them in a merger.
It's also kind of a waste that you can't do anything more with merged creatures but merge them again; for some kind of ultimate power, it doesn't do much from a fetish perspective. Especially since you're going to want to merge as many Beasts as possible to free up space and maximize your mana production.
That said, the game does have potential if the author chooses to expand the game further. Expand the story, add a few more mana sinks, add something to do if you're not hunting a new person, and let us queue up multiple transformations if we have the apprentices for it, and it would be a pretty good game.