Playing around in Cheat Engine and I was able to figure out the ranks for the cat minigame in the last level. most of these change rank every 5000 but a few.

0 to 1999: LAZY PAWS 2000 to 4999: IDLE WHISKERS 5000 to 9999: MR. CUDDLEBOTTOMS 10000 to 19999: SNUFFLE MUNCHKIN 20000 to 24999: SNUGGLEPUSS 25000 to 29999: NIP COMMANDER 30000 to 34999: COD STOCKING 35000 to 39999: CATNADO 40000 to 42999: YULETIDE PUSS 43000 to 49999: CATACLYSM 50000+: SANTA CLAWS