Hi Hythrain thank you for checking the game out!
Oh thank you for pointing out that I missed the full screen option, definitely just a page setup oversight on my part.
Catalogue of cat's you've completed puzzles with is definitely on its way! Just that little duplicate card bug is being a pain and slowing progress, but thank you for the bug report and the recommendation they are very much appreciated!
"black cat on stage four knocked the other two cats out when, prior to that, they had never bapped a cat that was already in a box" this is a good point actually it does break the interaction rules with that cat, I'll update that level because thinking about it it is quite confusing.