Having sat by my PC for the last 24 hours with just a brief catnap, it's safe to say that I am finding this game purrfect.
The only issue I have with gameplay is the blessing which automates buying cat levels. It buys levels one-by-one rather than how they are selected with manual buying (milestone, in my case). Buying levels one by one is pretty useless and a waste of a blessing, in my opinion.
But you guys have pretty much thought of everything. The only thing that I think could be added, which would be something I think you could have fun with would be achievements (with or without rewards).
There are virtually limitless options for what you can award an achievement for and the possibility of just a name or a long description/conversation attached to each one is there. I only mention this as you seem to be into the humour and the writing as much as the gaming.
I just remembered something else. Sometimes, but not always, there is a 10th level to the x3 multiplier favour.
Blessings is it, right? There isn't another layer of prestige waiting to pounce, is there?
Great game :)