Mac User here, no achievements have popped up after completing the game

You say you reworked it and made it harder. It was easy. Took me 3 minutes. The area is almost empty of anything but cats. No other organic shapes etc to make it harder at all. At least try. Come on.

A "bonus" is something you get extra for free... not the case here. It's an additional/extra level that you need to pay for to get it, but in this case, it's worth it

There's some sort of glitch in how the timers are being saved in both this hidden robo cats came and the hidden cats in winter. If you look at my screen shots for both games that I completed today, you'll see the timer is identical down to the millisecond. One of them I did in half the time of the other one. So there's clearly a bug in how the timers are being saved in player save files. Maybe they are using the same variable name in both games--I'm not sure how it's happening, but it's weird. My screen...